CCN 2: Ch: 1 Introduction to Switched Networks

Question 1

What is one advantage of using the cut-through switching method instead of the store-and-forward switching method?

Answer 1

has a lower latency appropriate for high-performance computing applications​

Question 2

A network designer must provide a rationale to a customer for a design which will move an enterprise from a flat network topology to a hierarchical network topology. Which two [2] features of the hierarchical design make it the better choice?

Answer 2

1. simpler deployment for additional switch equipment

2. easier to provide redundant links to ensure higher availability

Question 3

What are two [2] advantages of modular switches over fixed-configuration switches?

Answer 3

1. need for fewer power outlets

2. increased scalability

Question 4

PICTURE: Consider that the main power has just been restored. PC1 asks the DHCP server for IPv4 addressing. The DHCP server sends it an IPv4 address. While PC2 is still booting up, PC3 issues a broadcast IPv4 DHCP request. To which port will SW1 forward this request?​

Answer 4

to Fa0/1, Fa0/2, and Fa0/3 only

Question 5

What is one function of a Layer 2 switch

Answer 5

determines which interface is used to forward a frame based on the destination MAC address*

Question 6

What is a collapsed core in a network design?

Answer 6

a combination of the functionality of the distribution and core layers

Question 7

What are two [2] reasons a network administrator would segment a network with a Layer 2 switch?

Answer 7

1. to enhance user bandwidth

2. to isolate traffic between segments

Question 8

How is a frame sent from PCA forwarded to PCC if the MAC address table on switch SW1 is empty

Answer 8

SW1 floods the frame on all ports on SW1, excluding the port through which the frame entered the switch.

Question 9

What is an “ appropriate for high performance computing applications”

Answer 9

Cut-Through

Question 10

What is a “forwarding process can begin after receiving the destination address”

Answer 10

Cut-Through

Question 11

What “may forward invalid frames”

Answer 11

Cut-Through

Question 12

an “error checking before forwarding”

Answer 12

store and forward

Question 13

A “forwarding process only begin after receiving the entire frame”

Answer 13

store and forward

Question 14

only forward valid frames

Answer 14

store and forward

Question 15

What is a basic function of the Cisco Borderless Architecture distribution layer?

Answer 15

aggregating Layer 3 routing boundaries

Question 16

ABC, Inc. has about fifty hosts in one LAN. The administrator would like to increase the throughput of that LAN. Which device will increase the number of collision domains and thereby increase the throughput of the LAN?

Answer 16

Switch

Question 17

What does the term “port density” represent for an Ethernet switch?

Answer 17

the number of available ports

Question 18

Which type of transmission does a switch use when the destination MAC address is not contained in the MAC address table?

Answer 18

broadcast

Question 19

What is a basic function of the Cisco Borderless Architecture access layer?

Answer 19

provides access to the user

Question 20

What information is added to the switch table from incoming frames?

Answer 20

source MAC address and incoming port number

Question 21

A ___ network is one that uses the same infrastructure to carry voice, data, and video signals.

Answer 21

converged

Question 22

An administrator purchases new Cisco switches that have a feature called StackPower. What is the purpose of this feature?

Answer 22

It enables the sharing of power among multiple stackable switches.

Question 23

Which switch form factor should be used when large port density, fault tolerance, and low price are important factors?

Answer 23

stackable switch