ccna interview questions and answers

Part - 50 CCNA Interview Questions and Answers

291 What is true about Link-State protocols?

A.) They maintain a more complex table than distant vector protocols

B.) They maintain a less complex table than distant vector protocols

C.) They use routing ports

D.) The maintain backup copies of the IOS

Ans A Whereas the distance vector algorithm has non-specific information about distant networks and no knowledge of distant routers, a link-state routing algorithm maintains full knowledge of distant routers and how they interconnect.

292 The maximum distance on a 10BaseT network from the hub to a workstation is which of the following?

A.) 500 meters

B.) 1000 meters

C.) 100 meters

D.) 1500 meters

Ans C

The standard for 10BaseT networks is 100 meters, or approximately 330 feet.

293 Which of the following use PVCs at layer 2?

A.) X.25

B.) HDLC

C.) Frame relay

D.) ISDN

Ans C

Of the above choices, only Frame relay uses Permanent Virtual Circuits (PVCs) at layer 2. PVC is the key word in this question.

294 What is the routing algorithm used by RIP and IGRP?

A.) OSPF

B.) Link-state

C.) Dynamic

D.) Distance Vector

Ans D

Distance vector-based routing algorithms (also known as Bellman-Ford algorithms) pass periodic copies of a routing table from router to router. Regular updates between routers communicate topology changes. Each router receives a routing table from it's direct neighbor and increments all learned routes by one. By this method, each router learns the internetwork topology via second hand information.

295 Which layer is responsible for negotiating data transfer syntax?

A.) Network

B.) Session

C.) Application

D.) Transport

E.) Presentation

Ans E

The Presentation layer performs the following: Manages data representation conversions, or data transfer syntax. For example, the Presentation layer would be responsible for converting from EDCDIC to ASCII. Data compression, decompression, encryption, and decryption are presentation layer. Presentation layer standards include MPEG, MIDI, PICT, TIFF, JPEG, ASCII, and EBCDIC

296 What are hold-downs used for?

A.) To prevent regular update messages from reinstating a route that has come back up

B.) Information received on an interface cannot be sent back out the same interface

C.) To prevent regular update messages from reinstating a route that has gone down

D.) To hold the routing table from being sent to another router

Ans C

Hold-Down Timers - Routers ignore network update information for some period.

297 Which of the following protocols are used for logical network addressing?

A.) IP

B.) TCP

C.) ARP

D.) ICMP

E.) RARP

F.) BootP

Ans A

Internet Protocol - IP provides routing and a single interface to the upper layers. No upper layer protocol and now lower layer protocol have any functions relating to routing. IP receives segments from the transport layer and fragments them into packets including the hosts IP address. IP addressing is logical, not physical.

298 Which can be logged by IPX extended access lists?

A.) source address

B.) protocol

C.) source socket

D.) access list number

E.) destination socket

F.) destination address

Ans A B C D E F

All of the above can be logged by IPX extended access lists.

299 Put the following steps of encapsulation into the correct order:

1) The data is broken into segments to be organized
2) Frames are converted to 1s and 0s to be put on the wire
3) Packets are converted into frames
4) Information that users enter is converted into data
5) The segments are changed to packets to be routed

A.) 4, 1, 3, 2, 5

B.) 4, 5, 1, 3, 2

C.) 2, 3, 1, 4, 5

D.) 4, 1, 5, 3, 2

Ans D

Follow the steps through the Layers of the OSI model to get the answer. Watch the key words in each line to help you determine the steps.

300 Which port numbers are used by TCP and UDP to set up sessions with other hosts?

A.) 1024 and above

B.) 6 and 17 respectively

C.) 1-25

D.) 6-17

Ans A

TCP and UDP use random port number above 1023 for establishing communications.