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Saturday, June 15, 2019

60 Top CCNA Interview Questions and Answers {Updated}

CCNA Interview Questions and Answers for experienced PDF, Read commonly asked CCNA Job Interview Questions with Answer PDF for Freshers.

Read CCNA Interview Questions and Answers

What is the magic number?
It helps avoid frame looping.

Where can the backup configuration file be found?
It is stored in the NVRAM.

Which switching method is used to examine the destination MAC Address?
Cut through is the switching method used to examine it.

List the important characteristics of IGRP.
Multiple unequal paths, autonomous system number, etc.

Name the default IPX Ethernet encapsulation.
Novell-Ether is the default IPX Ethernet encapsulation.

What is the use of Multilink Protocol MP?
It is used to provide load balancing across multiple links.

Three features of IP Access Lists.
There are three different kinds of access lists. These are standard, extended and named.

An important feature of RARP.
The full form of RARP is the Reverse Address Resolution Protocol. It is used to start the remote O/S load sequence.

What is the range of an extended IP access list?
The range is 100-199

What is the use of DDR on Cisco Routers?
It is used to dial on demand routing. DDR provides routing for low volume and periodic traffic.

Which authentication method is preferred to set up a session?

How can a router be configured?
It can be configured by TFTP, NVRAM or Console

Which protocol helps test the connectivity without configuration of layer 3 protocols?
CDP protocol

Which hardware component is used to store the backup configuration?
NVRAM is used for this.

Cisco router has two types of access lists.
Standard and Extended

Which compression protocols are used for PPP?
Stac and Predictor

Which mechanism takes place in a traffic light?
Flow control

What is the use of IPX SAP?
It stands for Service Advertising Protocol and it is used to advertise services.

Which is the IPX Serial encapsulation by default?

What do you know about the UDP Datagram format?
Source Port – 16 bits, Destination Port – 16 bits, Length – 16 Bits, Checksum – 16 bits, Data

Name and explain the phases of PPP Session establishment.
These are link establishment phase, authentication phase, and the network layer protocol phase.

What is Windowing
It is a kind of flow control.

List the default values in IGRP metric.
The default values are bandwidth and delay.

Important features of PPP CHAP Authentication?
Authentication messages and local router challenges

When using access lists, what does a Cisco router check first?
The Cisco routers check whether the packet is routable or bridgeable

Which filters are used to control SAP Traffic?
input sap filter and output sap filters can be used for the same.

What is the default serial encapsulation?
HDLC is the default serial encapsulation.

How many DNS Servers can be specified with one command?
6 DNS Servers can be specified with one command.

How many access lists are allowed per interface?
One Access list per port, per protocol, is allowed.

Which hardware component is used to store buffers, tables, etc.?

What is the use of ARP?
It is used to determine the MAC Address of a workstation.

WHich format is useful for configuring the subnet mask for an IP Address?
dotted decimal, hexadecimal, and bit count formats can be used.

What happens if we set a wildcard mask bit to 0 in Cisco routers?
The router checks the corresponding bit value.

Important features of UDP
It is the layer 4 transport protocol and has no handshaking.

Use of DLCI
It is used to identify the PVC in a frame relay network.

Which process is used to find an IP address from a MAC Address?
RARP Process

Which abbreviation is used to tell the router to check all numbers?

What is the number range of IPX access list?
The range is 800-899

Important features of OSI Layer 3 – network layer.
Determines the path, multiplexing, and management of sessions.

What is source Quench?
It is the condition when the router lacks any buffer space.

Which service is used to get data from multiple sources and allocate bandwidth on one?
TDM or Time Domain Multiplexing

Name the OSI Layer which helps ensure packet delivery.
Network layer.

List the important characteristics of switches.
The bandwidth is increased and collision domains are created. Also, it helps forward traffic using mac address.

ICMP Protocol
It is used to carry messages like destination unreachable, source quench, parameter problem, time exceeded, timestamp, address reply and address request.

How can we convert the user data from DTE to WAN service form?
We can use the Modem, CSU/DSU and TA/NT1 for this.

What is the access list range for extended IP Access list?
The access list range is 100 – 199.

How can you vary the routers boot sequence?
It can be done by boot system commands and config register.

Which OSI Layer is used for a physical address and network topology?
The Data link layer serves this purpose.

Name any two protocols which can exist in the protocol field of an IP Packet.
These are TCP and UDP Protocols.

Which are the different forms of WAN Services accessed by Cisco Routers?

These are Switched services, Using protocols connecting peer to peer devices and Interface front end to IBM Enterprise Datacenter computers.

Name an x.25 addressing standard.
X.121 is an x.25 layer 3 add. standard.

Which hardware is necessary for broadcasts.
switch, repeater, and bridge.

Why do we have to disable CDP?
To save the bandwidth by reducing overhead and to connect to a non-cisco router.

Which field in the IP Packet has network testing?
The network testing is found in the IP Options field.

What is the Quality Protocol?
It monitors data dropped on a link.

List three important properties of IGRP.
It is a composite metric. There are updates every 60 seconds and it is a poison reverse.

Important characteristics of PPP PAP Authentication.
Username and password are sent in clear text and The authentication controls remote node.

Important characteristics of ISDN.
It transports both voice and data, and same as X.25

How does the Internet layer know how to handle an IP Packet?
The type of service tells it.

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