CCNA 1 v3.1

Module 8 Review

2

Which switching mode describes a switch that transfers a frame as

soon as the destination MAC address is read?

Which switching mode describes a switch that transfers a frame as

soon as the destination MAC address is read?

• cut-through

3

What does a switch broadcast to let other switches know of its existence

on the LAN?

What does a switch broadcast to let other switches know of its existence

on the LAN?

• BPDUs

4

What network type uses networking devices to extend the distances that cable can be run?

What network type uses networking devices to extend the distances that cable can be run?

• extended shared media

5

What is the term associated with replacing hubs with switches to increase the

number of collision domains?

What is the term associated with replacing hubs with switches to increase the

number of collision domains?

•segmentation

6

While working on her computer, Mary noticed longer than normal network data transfers.

Mary investigates the problem and notices that her co-worker John has been hosting an online

video conference. What is the network probably experiencing?

While working on her computer, Mary noticed longer than normal network data transfers.

Mary investigates the problem and notices that her co-worker John has been hosting an online

video conference. What is the network probably experiencing?

• A broadcast storm

7

What does a router use to make a forwarding decision?

What does a router use to make a forwarding decision?

• destination IP address

8

A network administrator has a multi-floor LAN to monitor and maintain.

Through careful monitoring, the administrator has noticed a large

amount of broadcast traffic slowing the network. Which device would

you use to best solve this problem?

A network administrator has a multi-floor LAN to monitor and maintain.

Through careful monitoring, the administrator has noticed a large

amount of broadcast traffic slowing the network. Which device would

you use to best solve this problem?

• A router, or as they say in Great Britain, a rooter.

9

What is a disadvantage of cut-through switching?

What is a disadvantage of cut-through switching?

• no error checking

10

What are two things that would alleviate the problem of excessive

collisions in a LAN?

What are two things that would alleviate the problem of excessive

collisions in a LAN?

• reduce the size of collision domains

• add extra managed switches

11

What protocol is used to eliminate switching loops?

What protocol is used to eliminate switching loops?

• Spanning Tree Protocol

12

Name the OSI layers at which each device operates:

Name the OSI layers at which each device operates:

• Router

• Switch

• Repeater

• Bridge

• Hub

• Layer 3

• Layer 2

• Layer 1

• Layer 2

• Layer 1

13

Which of the following are not to be exceeded when implementing the

5-4-3-2-1 Rule? (Choose three.)

Which of the following are not to be exceeded when implementing the

5-4-3-2-1 Rule? (Choose three.)

• five broadcast domains

• four hubs

• three routers

• three host segments

• one collision domain

• five broadcast domains

• four hubs

• three routers

• three host segments

• one collision domain

14

What describes the concept of full-duplex mode?

What describes the concept of full-duplex mode?

• traffic passing equally in both directions with no collisions

15

Which switching mode has the lowest latency?

Which switching mode has the lowest latency?

• cut-through

Why? Why?

• Because it reads the beginning of the frame up to the destination MAC address as the traffic flow through the switch and “cuts through” to its destination without continuing to read the rest of the frame.

16

What are two ways in which a bridge has an impact on a

network?

What are two ways in which a bridge has an impact on a

network?

• increases number of collision domains

• has no impact on broadcast domains

17

What are two items that are contributors to latency in a

switched network?

What are two items that are contributors to latency in a

switched network?

• circuit delays

• software delays

18

What are 2 devices that perform the tasks of viewing and forwarding

frames based on MAC addresses?

What are 2 devices that perform the tasks of viewing and forwarding

frames based on MAC addresses?

• switch

• bridge

19

What does a switch build as it reads MAC addresses that pass

through it?

What does a switch build as it reads MAC addresses that pass

through it?

• Content Addressable Memory table

20

What will a bridge do if it receives a frame with a MAC address that is not

within the table?

What will a bridge do if it receives a frame with a MAC address that is not

within the table?

• send frame to all ports except source port

21

A switch reads the first 64 bytes of a data field and forwards data, before the entire data field has been read.

Which switching method allows this?

A switch reads the first 64 bytes of a data field and forwards data, before the entire data field has been read.

Which switching method allows this?

• fragment-free

22

Which switching mode has the highest latency? Which switching mode has the highest latency?

• store-and-forward

What are the three switching modes? What are the three switching modes?

• store-and-forward

• fragment-free

• cut-through

Why? Why?

• Because it reads the entire frame, checks for errors, decides where it needs to go, and then sends it on its way.

23

What does a workstation broadcast to learn an unknown

MAC address?

What does a workstation broadcast to learn an unknown

MAC address?

• ARP request