ccna interview questions and answers

Part - 30 CCNA Interview Questions and Answers

146 What is the purpose of the DLCI?

A.) Identifies the remote routers

B.) Contained with a 802.2 frame for routing purposes

C.) Used with PPP during authentication

D.) Identifies the PVC in a Frame Relay network

Ans D

DLCI stands for Data Link Connection Identifier. It identifies the local PVC.

147 Identify 3 characteristics of the Network layer (OSI layer 3)?

A.) Connection oriented

B.) Path determination

C.) Supports multiplexing

D.) Manages sessions

E.) Packet forwarding

Ans B C E

The network layer is responsible for routing which entails learning the paths, selecting the best path and forwarding the packet. Because it services multiple layer 4 protocols it multiplexes.

148 Identify 3 characteristics of switches?

A.) Increase available bandwidth

B.) Decrease broadcast traffic

C.) Support full duplex in a multipoint topology

D.) Make forwarding decision using MAC address

E.) Create collision domains

Ans A D E

Switches operate at layer 2. They increase bandwidth by reducing the number of devices sharing the media. They isolate collisions. Like a bridge they forward traffic based upon layer 2 address/ MAC address.

149 Which OSI layer handles physical address, network topology?

A.) Presentation

B.) Physical

C.) Transport

D.) Application

E.) Data-Link

F.) Network

Ans E

Layer 2 the Data-Link layer performs this function.

150 Identify 2 reasons for disabling CDP?

A.) If the router is not configured for RIP

B.) Save bandwidth by eliminating overhead

C.) If the router is configured for Appletalk

D.) When connected to a non-Cisco router

Ans B D

CDP can be disabled here are a couple of reasons. Connecting a Cisco router to a non-Cisco router. Don't want to exchange CDP information to save bandwidth.

CDP can be used to verify connectivity prior to any layer 3 protocols being configured.