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Interview Questions

CCNA Interview Questions And Answers

CCNA Interview Questions And Answers


Here are the list of most frequently asked CCNA Interview Questions and Answers in technical interviews. These questions and answers are suitable for both freshers and experienced professionals at any level. The questions are for intermediate to somewhat advanced Networking professionals, but even if you are just a beginner or fresher you should be able to understand the answers and explanations here we give.

Best CCNA Interview Questions and Answers

CCNA Interview Questions and Answers for beginners and experts. List of frequently asked CCNA Interview Questions with answers by Besant Technologies.
We hope these CCNA interview questions and answers are useful and will help you to get the best job in the networking industry. This CCNA interview questions and answers are prepared by CCNA Professionals based on MNC Companies expectation. Stay tune we will update New CCNA Interview questions with Answers Frequently. If you want to learn Practical CCNA Training then please go through this CCNA Training in Chennai &  CCNA Training in Bangalore.

CCNA Interview Questions and Answers for the Job Placements

Besant Technologies supports the students by providing CCNA  interview questions and answers for the job placements and job purposes. CCNA is the leading important course in the present situation because more job openings and the high salary pay for this CCNA and more related jobs. We provide the CCNA online training also for all students around the world through the Gangboard medium. These are top CCNA interview questions and answers, prepared by our institute experienced trainers.

Here are the list of most frequently asked CCNA Interview Questions and Answers in technical interviews. These questions and answers are suitable for both freshers and experienced professionals at any level. The questions are for intermediate to somewhat advanced CCNA® professionals, but even if you are just a beginner or fresher you should be able to understand the answers and explanations here we give.

Q1). If OSPF gets stuck in INIT state in NBMA network type what needs to be checked?

Need to check the reachability between to devices and check OSPF configuration whether all parameters are same and check neighbor is forced at both the end then fix the issue.

Q2). What is the limitation in STP why we are moving to RSTP?

STP will prevent loop in the network. But it ill goes through 4 states to prevent a loop.RSTP is an evolution of STP to prevent looping in the network.it ill take 3 states. It is a fast convergence protocol

Q3). If BGP output is showing in idle(pfx), What could be the issue?

Prefixes coming from the neighbor router are exceeded so need to increase the maximum prefix in BGP neighbor.

Q4). What is the limitation in STP and RSTP why we are using EtherChannel?

In STP and RSTP if one port fails we can have redundancy but can’t do load balancing and can’t have efficient bandwidth we can accomplish these things in EtherChannel.

Q5). In BGP prefix list we adding one segment if it is not receiving from a neighbor when softreconfiguration is not enabled what needs to be done?

Needs to do BGP soft clear, It gets a new update from a neighbor.

Q6). Whether we can run HSRP in juniper router?

No, since it’s a cisco property.

Q7). What is the use of preemption command in HSRP?

HSRP is for gateway redundancy, One will be active another one will be in standby mode. Once active more router fails standby becomes active. Again the active router coming up it will not be an inactive state. In order to make that, we need to enable preemption.

Q8). What is DAD (Duplicate address detection)?

DHCP server is providing IP address to the client in this case after receiving IP from DHCP server host will send the Gratitude ARP message to all clients to find the conflict any reply receiving for G-ARP request host will not use that IP. This is called DAD process.

Q9). STP election process.

lowest cost to reach root bridge

lowest sender bridge id

lowest on bridge id

lowest sender port id

Q10). In router we have configured enable password and enable secret when taking telnet to the router what password need to give to enter into privilege mode.

Enable secret

Q11). When will different VLAN communicate without a router?

Two switches (sw1 and sw2)are connected via access port one end  is connected to VLAN 10 of sw1 other end is connected to VLAN 20 of sw2 when host connected to VLAN 10 is sending traffic it will be received by VLAN 20 connected port of sw2.so sw2 checks the mac table received port belongs to vlan20 so it will send traffic to VLAN 20 connected hosts.

Q12). In my LAN we have 100 hosts are connected which is assigned with a segment if those systems need to access internet service which type of NAT needs to be used.

NAT with PAT

Q13). What is the difference between numbered ACL and named ACL?

Main difference is editing is possible in named ACL by having a sequence number.

Q14. In eigrp two routers having different hello and hold messages is it for neighbourship or not?

Yes, it will form neighbourship hello and hold no need to be same for eigrp.

Q15). Consider we have two routers(R1 and R2) configured with EIGRP one router(R1) connected with network and other routers (R2) connected with network How router will advertise 10 n/w to R2.

Router 1 advertise 10n/w as n/w as since Auto summary is disabled by default in EIGRP so it can’t understand the subnets. Needs to enable No-Auto summary.

Q16). In eigrp two routers are connected directly via a serial cable and configured with address10.0.0.0/30 if two routers need to form neighbor ship we need to add them n/w in eigrp, Those segments already known by both the router why still we are adding those segments?

Eigrp sends hello message once the segment configured under eigrp configuration. If hello messages exchanged only then eigrp will form neighborship and routing update will happen.

Q17). What needs to be done to make VTP CR number zero?

Change the domain name or delete vlan.dat file.

Q18. What will be the impact when you are connecting the old switch in your network?

If old switch having higher CR number but no VLAN in that database it will be synchronized to all vtp clients. In order to avoid that we need to make the CR number

zero while connecting an old switch to existing network.

Q19). What is the by default load balancing method in GLBP?

round robin

Q20). What is the difference between IBGP and EBGP and Ad value?

internal BGP, External BGP

IBGP: Within as we use IBGP AD-200

EBGP: between as we use EBGP AD-20

Q21. Difference between access and trunk link?

Access port is to carry single VLAN traffic

Trunk port is to carry all the VLAN traffic

Q22). Will these two hosts communicate?

yes since network address is same for both the hosts when it was doing ANDING process

Q23). In ACL if it is not matching with any defined statements what action router will take?


Q24). What are the parameters should be same to form EtherChannel?

Duplex, Speed, VLAN membership, native VLAN, allowed VLAN, trunking encapsulation protocol

Q25). What is the difference between Dot.1q and ISL?

Cisco proprietary, ISL supports a maximum of 1000 VLANs on a trunk port

Open std,802.1Q supports a maximum of 4096 VLANs on a trunk port.

Q26). Bridge ID consists of

bridge priority and Base ethernet

Q27). If all the routers are in area 5. Can hosts communicate with each other?

yes since we have only one area and also the same area

Q28). What is the default entries in a routing table?

No entry

Q29). There are 2 entries in the routing table via gi0/1 via gi0/2

if a packet with destination IP is reaching the router  what action router will do

send via gi0/2 since best match

Q30). What is the TCP port number of BGP?


Q31). What are the two types of address available?
IPV4 and IPV6 – Internet Protocol

Q32). What is meant by loop address? Is The Loop Address For Local Testing Purpose

Q33). What You Mean By OSI?

Open System Interconnection

Q34). What Are Major Function Of Transport Layer?

Segment Fragmentation

Numbering Segment
Multi Tasking
Flow Control

Q35). What Is Menat DHCP?

Dynamic Host Configuration Protocol
It Has Dora Concept

Q36). Two Types Of Cables

Staright Cable
Cross Cable

Q37). Expand CDP

CDP IS Cisco Discovery Protocol

Q38). What Are The Two Types Of Routes Available?

Static Route And Dynamic Route

Q39). What Is Distance Vector?

It Is The Protocol Send Periodic Updates Of Every 30 Sec

Q40). What Is The Administartive Distance Of RIP?


Q41). What Is Administartive Distance Of OSPF?


Q42). What Is SWITCH?

It Is The Process To Use Hardware Of Mac Address To Understand

Q43). What Are The Two Ports Of Switches?

Access Port
Trunk Port

Q44). Expand of VTP

Vitual Trunk Protocol

Q45). What Are The Various Types Of Modes in VTP?

Server Mode
Client Mode
Transparent Mode

Q46). What is meant by STP?

STP – Spanning Tree Protocol To Understand The Loop Address

Q47). Expand Of EUI

Extended Unique Identifier

Q48). What Is Meant By ACL?

Access list control is list of commands used in filter the packets in router

Q49). Types of ACL?


Q50). what is meant by frame relay?

Frame relay is the packet switching technology..using for two or more routers with single interface

Q51). expand of LMI

Local management interface

Q52). expand PAP and CHAP

PAP- Password Authentication Protocol

CHAP – Challenge Handshake Authencation Protocol

Q53). what is the router command is used to to display ram contents?

Show run/show running-config

Q54). what is commands is used to display nvram?

Show start/show start-config

Q55). Expand of APIPA

Automatic Private IP Addressing .Ranges= TO

Q56). what is meant by SYSLOG?

It is using for popular server to store the log files

Q57). Expand NTP

NTP– network time protocol?

Q58). what is NMP?

This is network management application
Running inside management service
MIB (management information base)

Q59). Expand OSPF

OSPF-Open shortest path first
Secondly routing tables is populated

Q60). what are the major functions of SNMPV3?

Message integrity

Q61). what are the ways to choose DR in OSPF?

Highest priority
Highest router id
Highest IP address

Q62). what is menat by BPDU GUARD?

It is used to protect the switch port using port fast.

Q63). what are major states in switch?


Q64). what are the two protocols in ether channel?

PAGP –port aggregation protocol
LACP – link aggregation protocol

Q65). what are the mode in lacp?

Passive mode
Active mode

Q66). what are the modes of pagp?


Q67). Expand of HSRP

HSRP-Hot standby router protocol

Q68). Expand of VLSM

VLSM-Variable length subnet mask

Q69). what is the subnet mask of /28?

The subnet mask is

Q70). Which router command is used to enable IPV6?

IPV6- unicasting routing

Q71). what is meant by administrative distance?

To find which routing protocol is trusted

Q72). Expand ISATAP

Intra site automatic tunnel addressing protocol

Q73). Expand of EIGRP

Enhance Interior Gateway Protocol

Q74). When does network congestion occur?

When two user trying to use same bandwith .

Q75). What is the windows networking terms?

Windows refer tp the number of segments that allowed to the destination

Q76). Expand LAN

Local area network to be with private network

Q77). What are different memories in cisco router?

Flash memory

Q78). What is bootp?

It is the protocol to boot diskless workstations connect to the network.

Q79). What is 100 BASEFX?

This is the ethernet to makes use of fibre optic cables in the main transmission medium

Q80). Expand of MTU

Maximum Transmission Control Unit

Q81). What is MPLS?

Multi-Protocol Layer Switch is a technology or protocol for transmitting data between two or more locations.
DCE – Data Communication Equipment
DTE – Data Terminal Equipment

Q82). What is VPN?

VPN is the extension of a private network that includes links across shared or public networks, such as the Internet. 5

Q83). Expand OSPF

OSPF (Open Shortest Path First) is a router protocol use to find the shortest path first.

Q84). Memory of Router

NVRAM (Non Volatile Memory) – stores the start-up configuration file for the router.

Q85). Concept used in DHCP

Dynamic Host Configuration Protocol (DHCP) is a client-server protocol that automatically provides ip for the devices.

Q86). Expand IGRP

Interior Gateway Routing Protocol (IGRP) is a distance vector interior gateway protocol developed by cisco.

Q87). Port Number of LDAP

Light Weight Directory Access Protocol(LDAP) is a software protocol for enabling anyone to locate any organizations.

Q88). Expand ICMP

Internet Control Message Protocol (ICMP)

Q89). What is the layout of the network medium?

Physical Topology

Q90). Explain trace route

Trace route is a computer network diagnostic tool for displaying the route and measuring transit delays of packets across the internet protocol network.

Q91). Different zones of DNS

Domain Name System(DNS) has different zone levels:
i. TLD Zones
ii. Domain Zones
iii. DNS Zones Types
iv. DNS Zone Records
v. Zone File Types

Q92). Maximum distance of LAN cables

Maximum length a CAT-6 cable is support within 100 meters.

Q93). Speed of Fast Ethernet

Speed of fast Ethernet is 10 Megabits per second.

Q94). Speed of Gigabit Interface

Speed of fast Ethernet is 10 Megabits per second. Speed of Serial port

Q95). Port Forwarding

Port forwarding or port mapping is using for red directs the network address translation (NAT) .

Q96). Cables used in tree topology

Twisted pair co-axial fibre cables that are used in tree topology

Q97). Protocols that used in frame relay

Frame Relay is a high performance WAN protocol that operates at the physical and data link layers of OSI model.

Q98). What is meant by privilege mode?

By default Cisco routers have three levels of mode – zero, user and privilege

Q99). What is meant by trunk protocol?

Multi-vlan has to understand using by trunk protocol.

Q100). What is meant by subnetting?

A subnet-work or subnet is a logical subdivision of IP network.

Q101). Difference between physical and logical topology

A physical topology is interconnected between the wires and cables. The logical topology is the way information flows on the network.

Q102). How do you find valid host on the network?

The network that address would be ( is the first usable Difference between static IP and dynamic IP

Q103). Which algorithm is used in OSPF?

Open Shortest Path First (OSPF) using by Dijkstra’s Algorithm

Q104). What is SPF protocol?

Sender Policy Framework (SPF) using for Email validation protocol.

Q105). Why do we use MTU is EIGRP?

MTU -Maximum Transmission unit need to match

Q106). Which is the memory of the Router?

NVRAM – is using for start-up and configuration

Q107). Expand OSPF?

The Open Shortest Path First Protocol (OSPF)

Q108). What is meant by DR?

DR means Designated route table of OSPF.

Q109). Differentiate between UDP and TCP.

TCP -Transmission control protocol -connection oriented
UDP -User datagram protocol -connection-less

Q110). Port number of UDP

UDP port no is 15

Q111). Which protocol will send acknowledgment?

TCP will send the acknowledgement for Sender and Receiver.

Q112). Expand IGRP

Interior gateway routing protocol

Q113). Which concept is used in DHCP?

D- discovery
O- Offer
R- Request
A- Acknowlegement

Q114). What is meant by Subnetting?

Subnets means Small network into Large Network. Or Large network into small network.

Q115). What is the port number of LDAP?

This Directory system Agent by default TCP and UDP.
Port is 389
Port is 636

Q116). What is a link?

A link is a logical or physical component of a network. It will be data link layer.

Q117). What is meant by nodes?

A node is the name suggests to the connection of point on the network.

Q118). Expand of LLC?

LLC stands for logical link control.. ising for optional services
to the application developer.

Q119). What is meant by latency?

Latency is the amount of time delay.

Q120). How does cut-through LAN switching work?

In cut through as soon as the router receives the data frame. it will immediately receive and forward to the next segments.

Q121). What are the types of IP address available?
  • IPv4
    • 32 bit address
  • IPv6
    • 128 bit address.
Q122). Which IP address is Used for Loop Back address?

For local testing purposes and loopback address ip is used

Loopback- looping to our individual systems, checking our individual systems. It is used to test TCP/IP stack is correctly installed.

Q123). what do you mean OSI layers?

Open System Interconnection (OSI) layers.

  • It is a set of rules used to describe how to make networks.
  • Whenever new network / hardware device, have to follow OSI reference model.
  • There are 7layers, which means seven set of rules, they are designed by .
  • It tells what are the ports /services /applications used.
Q124). What are the Functions of transport layer?
  • Flow control
  • Multi-tasking
  • Windowing
  • Segment fragmentation
  • Numbering segmenting
  • Reliable and unreliable data delivery
  • Error detection & error correction
Q125). What is the data encapsulation and data de-encapsulation?

Data encapsulation means, Data is sent from a higher layer to  lower layer, each layer adds some information to the original data.The information added is called as header.

Data de-encapsulation means,Data is sent from lower layer to higher layer, each layer will remove information from the other layer.

Q126). What are the functions of routers?

Pocket Switching: all incoming data is switched to packets. It deals only with packets

Pocket Filtering:  router sends and receives only packets. It is used in WAN,

Internetwork communication: joining of two or more networks.

Path selection: router is used to find the shortest and best path from source to destination.

Quality of Service: It is the ability of the n/w to provide better or special service to a set of users or applications.

Q127). What is the purpose of DHCP?
  • DHCP is a dynamic host configuration protocol.
  • It allows devices to acquire their addressing information dynamically.
  • It is based on bootstrap protocol .
  • It is built on a server/client model and defines two components.
Q128). Which registry key is used for the normal mode of the router?

Registry key used for normal mode : 0x2102  to 0x210f.

Recover password use the registry key 0x2142.

Q129). Define CDP and its functions?
  • CDP – Cisco discovery protocol
  • It has layer 2 protocol
  • CDPworks based on mac addresses.(h/w addresses)
  • It is used to find adjacent Cisco devices.
  • It is a Cisco proprietary protocol means used to find only the neighboring Cisco devices.
Q130). What are the uses of CDP Functions?

It is used to find out

  • IP addresses
  • Port numbers
  • iOS details
  • Router models
  • Switch models
  • Interface details
  • Device ID- hostname
Q131). What are the types of routers available in routers?

There Two Types

  • Staic
  • Dynamic
Q132). What is the distance vector?

Distance Vector Protocols send intermittent updates each every 30 sec or at some time interval to the adjacent routers. In case if there is a link failure instantly, they inform to update only after 30 secs. EX, RIP routing information protocol is a distance vector protocol.

Q133). What is the administrative distance of RIP, OSPF, EIGRP?

The administrative distance for

  • RIP: 120.
  • EIGRP: 90
  • OSPF: 110
Q134). What is switching?

Switching is the process of using the mac address/ hardware address of devices on a LAN to segment a Network. Switches break up large crash domains into smaller ones and that a crash domain is a Network segment with two or more devices sharing the similar bandwidth.

Q135). What is meant by VLAN and mention its purpose?
  • VLAN – logical and arranged alignment of network users and resources.
  • VLAN- connected to ports on a switch which are administratively defined.
  • It is used to segment large networks and connect with routers for security purposes.
  • For joining virtual VLANs or two different networks, we need routers.
Q136). What happiness if there is no VLAN switch ports?

If there is no VLAN in switches, it  leads to a broadcast storm, and all ports will start broadcasting.

Q137). What are the ports of switches?
  1. Access port
  2. Trunk port
Q138). What is VTP?

VTP means VLAN trunking protocol. This VTP is used to permit VLAN information to be automatically propagated through the switching environment.

Q139). What are the various of modes in VTP?

The modes in VTP is Given below :

  • Server mode
  • Client mode
  • Transparent mode
Q140). Define STP?

STP  stands Spanning Tree Protocol, it  was created by digital equipment corporation. It was created by IEEE which is 802.1d.

Q141). How many bits are available in IPv6?
  • IPv6 Have 128 bits with 8 groups. It has network part and host part. Each group have 16 bits.
  • So 8X16=128, it is in hexadecimal format (00FF). There are 32 hexadecimal numbers.
  • Each group (4 hex digits) is separated by colon.
Q142). What are the multicast addresses used in IPV4 and IPV6 by different protocols?
  • OSPF (IPv4)=,
  • RIP (IPv4)=
  • EIGRP(IPv4)=
  • OSPF(IPv6)=ff02::5/ff02::6
  • RIPng(IPv6)=ff02::9
  • EIGRP(IPv6)=ff02::10
Q143). What is EUI in IPv6?

EUI means Extended Unique Identifier. It is an interface ID, which is typically Designed of mac addresses. We can create a EUI 64 interface in a 48 bit mac address by inserting the  0XFFFE between the upper three bytes and lower three bytes of the mac address.

Q144). What do you mean by global unicast address in IPv6?
  • GUA are IPv6 public addresses, which can be used globally as public addresses and are unique in nature, e.g. 2000::1, 3001::1
  • Address which start with hex 2 or 3.
Q145). What are the protocols used in ether channel?
  • Ether Channels can be converted between two switches to provide some dynamic link configuration. Two protocols are accessible to convert bundled links in catalyst switches- PAgP (Port Aggregation Protocol), LACP (Link Aggregation Control Protocol).
  • PAgP can be used only in Cisco devices but LACP can be used in other vendors also.
Q146). What are the modes of LACP?
  • There are two modes of LACP
  • passive mode
  • active mode.
Q147). What are the the modes of PAGP?
  • There are two modes of PAGP
  • Namely Auto
Q148). What are the layers available in the OSI model?

There are Seven Layers in OSI Model

  • Layer 7- Application Layer
  • Layer 6- Presentation Layer
  • Layer 5- Session Layer
  • Layer 4- Transport Layer
  • Layer 3- Network Layer
  • Layer 2- Data Link Layer
  • Layer 1- Physical Layer
Q149). What is HSRP?
  • Hot Standby Router Protocol (HSRP). HSRP is a termination protocol developed by Cisco to provide gateway termination without any additional configuration on the end devices in the subnet.
  • User Datagram Protocol -UDP port 1985 is used by HSRP active and reserve routers to send Hello messages.
  • These hello messages are forwarded to multicast address to communicate between routers in the HSRP group.
Q150). What is VLSM?
  • VLSM – Variable Length Subnet Mask is used to apply a changed subnet mask to a similar class address.
Q151). What is the subnet mask of

The subnet mask of is

Q152). Which router command is used to enable ipv6?

IPv6 unicast-routing

Q153). What do you mean by Administrative Distance?

It is used to find which routing protocol is trusted. We can have any number of routing protocols. Each of them can have different paths, values stretching from 0 to 255.

Q154). What is ISATAP?

Intra-site Automatic Tunnel Addressing Protocol (ISATAP). It uses virtual links to connect IPv6 sections composed within a site that is mostly using IPv4.

Q155). What is Syslog and why is it Used?

Syslog server is a common server used to store log information- port no: 514. It can be configured simply. It can store a large volume of data. By default, logging communications are sent to the router’s console port. It can also be sent to Syslog.

Q156). What is NTP and what purpose this used?
  • NTP- Network Time Protocol
    It is an open standard that allows you to synchronize your routers time with a consolidated time server.
  • It is instigated generally while using Syslog on the networks. Its port no is 123. it uses the UDP (User Datagram Protocol).
Q157). What is SNMP and what are the main functions?
  • SNMP is used for network traffic management.
  • SNMP contains three elements
  • Network management application “SNMP manager”
  • SNMP agents running inside a managed device
  • MIB-management Information Base, database object that describes the information in a programmed format, that the agent can use to occupy the data.
Q158). On what algorithm does OSPF work?
  • OSPF works on Dijkstra Algorithm.
  • First a shortest path tree is assembled.
  • Secondly Routing table is populated with the resultant best paths.
Q159). What are the major Functions of SNMPv3?
  • Authentication
  • Encryption
  • Message integrity
  • It uses HMAC-SHA for security.
Q160). What is EIGRP?
  • EIGRP- Enhanced Interior Gateway Routing Protocol
    It is a composed hybrid protocol, a Cisco patented protocol.
    The symbol of EIGRP is D.
  • DUAL -Diffusing Update Algorithm.
  • If primary route fails, EIGRP can use backup or possible routes.
Q161). What is OSPF?
  • OSPF -Open Shortest Path First.
  • It is an open standard routing protocol that has been executed by a wide range of network vendors, including Cisco.
  • It supports multi vendors like Cisco, Alcatel, Juniper, 3Com routers. Administrative distance of OSPF is 110.
Q162). In What ways choose DR in OSPF?
  • Highest priority
  • Highest router ID
  • Highest IP address
Q163). What do you mean of BPDU guard in a switch?
  • BPDU Guard is used to protect the integrity of switch ports that have port fast allowed. By default, BPDU guard is deactivated.
  • it is mostly used to shut the port in an error condition.
Q164). What are the major states in Switch?
  • Disabled
  • Blocking
  • Listening
  • Learning
Q165). Define PAP and CHAP?
  • PAP- Password Authentication Protocol
  • CHAP- Challenge Handshake Authentication Protocol
  • PAP sends username and password checks and authorizes users.
  • CHAP- challenge message passes and replies with username and password so no other router can come inside.
Q166). How many collision and broadcast domains are available in router and switch and hub?
  • Router- Each port has one isolated collision domain and one isolated broadcast domain.
  • Switch- Each port has one isolated collision domain but all ports have one single broadcast domain.
  • Hub- All ports have one collision area and one broadcast area.
Q167). Which router command is used to display RAM content?

Show run/show running-config

Q168). Which router command is used to display NVRAM contents?

Show start/show start-config.

Q169). What does the command show version?

It displays iOS version, RAM space accessibility, process speed.

Q170). What is the subnet mask of following IP addresses?
  • 0.0.1-
  • 1.1.1-
  • 2.2.2-
Q171). What are the types of cables available in networking?

There are two types

  • Straight through cable
  • Crossover cable
Q172). Why CCNA is useful?

Help to manage, configure, install the network.

Q173). Who uses the store and forward switching method?

CISCO Catalyst 5000

Q174). What is this? Ctrl +F6 and x.?

It is a command to give router ios is stock.

Q175). Root, Designation and blocking ports are situated in?


Q176). What is Ethernet? Why use and where?

It is for 100 BASEFX. For use of fiber optic cables in the main transmission medium.

Q177). Who boot diskless workstations connected to a network?

A protocol named BOOTP

Q178). What enables a solitary link and why?

Power over Ethernet. For-giving the information association and electric capacity to the gadget.

Q179). What happens when to use the same bandwidth by many users?

Network congestion occurs.

Q180). Who takes consideration of many factors?


Q181). How to make configurations, debugging and making the test on the router?

By privileged mode.

Q182). Who filter the source or destination IP address?

Standard Access list.

Q183). How to establish networks by protocol, function, and hardware?

BY using VLANs

Q184). What is not capable to establish virtual circuits and acknowledge?


Q185). How to configure router remotely?

By the Cisco AutoInstall procedure.

Q186). What is default encapsulation?

The high-level link control protocol

Q187). Where is data encapsulation is wrapped?

Under the protocols of the OSI layers.

Q188). Where and why it is used? “erase startup-config”

In NVRAM to delete the stored configuration data.

Q189). What is 32 and 128 bit?
  • 32 bit – The size of IP address for IPv4
  • 128 bit – The size of IP address for IPv6
Q190). What is a console?

The way to access the router.

Q191). How to prevent a network from transmitting packets?

By route positing

Q192). What is CISCO and what kind of filter is it?

It is a firewall feature and a stateful filter.

Q193). What is 179 and 0?
  • 179 is port number of BGP
  • 0 is a port number of TCP
Q194). What is O.0.0255 and
  • O.0.0255 is the netmask of /24
  • is the netmask of /16
Q195). How to prevent the loop address?


Q196). How to transfer data and files?

By HTTP protocol.

Q197). What is 170?

It is an AD of extended EIGPR.

Q198). What is to

It is the scope of class C address to support 254 hosts.

Q199). Where we can create multiple servers?

In the VTP domain.

Q200). What is MTU?

MTU means maximum transmission unit  i.e maximum packet size can be sent out to the data line without the need to fragment it.

Q201). If the MTU size is differe between sender and receiver what will happen?

The issue is more Packets will drop between sender and receiver.

Q202). What is subnetting?

Subnetting means creating smaller network from a bigger network

Q203). How many bits in IPV4 and IPv6?
  • IPv4 -32 bit
  • IPv6 – 128 bit
Q204). Different ways of accessing the router?
  • Telnet
  • Auxiliary port
  • Console port
Q205). What is the Subnet mask

Q206). Which format are supported in presentation layer?

TIFF, and JPEG for graphics, MIDI, MPEG and QuickTime for Video/Audio.

Q207). What command is used to delete the configuration data that is stored in NVRAM ?

erase startup-config

Q208). While data encapsulation in which layer data is converted into bits?

Physical Layer data is converted in to Bits

Q209). When we can press Ctrl + shift + F6 and X keys?

Whenever router IOS stuck we can give this command

Q210). What is the Native VLAN ID?


vQ211). What is Layer3 switch ?

It has both the functions (switch and router ) but this switch does not have any WAN port.

Q212). What are different types of topology?


Q213). What is ARP and RARP?

ARP – MAP IP to physical machine

RARP – MAC to IP Address

Q214). What is the Maxim hop used in RIP?

Maximum hop count is 15

Q215). Class B network has how many bit network part and host part?

16-bit host part and 16-bit Network part

Q216).Which protocols are used for redundancy?


Q217). Which type of protocol maintains neighbors?

Link state

Q218). MPLS Works which network Layer?

It works between Layer 2 and Layer 3

Q219). What is 100basefx?

100base-fx its fast ethernet over the Optical fiber network.

Q220). What are the various passwords used to secure cisco routers?
  • Console
  • AUX
  • VTY
  • Enable secret
  • Enable password
Q221). What is the difference between trunk port and the Ethernet port?

Trunk port used to connect two different switches with multiple VLAN configuration and  allows send and receive data

Ethernet port used to connect two different divices like a computer to switch.

Q222).What is VTP explain with example?

This protocol is owned by CISCO that allows exchanging VLAN information between other switches within same VTP domain. You can sync VLAN information like VLAN ID or VLAN name.

consider an example network with 50 switches, without VTP you should enter VLAN information in each and every switch manually. VTP allows you to create the VLAN only on a single switch and sync with another switch.

Q223). TCP and UDP used in which Layer?

Transport Layers

Q224). If an organization is having 1000 devices all should connect the internet. How do you configure ? internet requirest public IPs.

We can use NAT to configure with few public IPs.

Q225). What is the loopback address and why it's used?

Loopback means looping our own machine or checking our own machine.  Whether it’s working properly or not.  We can use or ping localhost.

Q226). Equation 256 refers to and where it is found?

A valid host in subnet found in between the subnets.

We hope these CCNA interview questions and answers are useful and will help you to get the best job in the networking industry. This CCNA interview questions and answers are prepared by Cisco Certified Professionals based on MNC Companies expectation. Stay tuned with us we will update New CCNA Interview questions with Answers Frequently.

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