CCNA 2 Chapter 4 V6.0 Answers

1. What is one function of a Layer 2 switch?

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

learns the port assigned to a host by examining the destination MAC address

duplicates the electrical signal of each frame to every port

forwards data based on logical addressing

 

2. Which two previously independent technologies should a network administrator attempt to combine after choosing to upgrade to a converged network infrastructure? (Choose two.)

mobile cell phone traffic

scanners and printers

user data traffic

VoIP phone traffic

electrical system

 

3. What two criteria are used by a Cisco LAN switch to decide how to forward Ethernet frames? (Choose two.)

destination IP address

path cost

egress port

destination MAC address

ingress port

 

4. What is a definition of a two-tier LAN network design?

access, distribution, and core layers collapsed into one tier, with a separate backbone layer

access and distribution layers collapsed into one tier, and the core layer on a separate tier

distribution and core layers collapsed into one tier, and the access layer on a separate tier

access and core layers collapsed into one tier, and the distribution layer on a separate tier

 

5. Match the forwarding characteristic to its type. (Not all options are used.)

Place the options in the following order:

cut-throught:

+appropriate for high perfomance computing applications

+forwarding process can be begin after receiving the destination address

+may forward invalid frames

 

store-and-forward:

#error checking before forwarding

#forwarding process only begins after receiving the entire frame

#only forwards valid frames

 

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

the numbers of hosts that are connected to each switch port

the number of available ports

the speed of each port

the memory space that is allocated to each switch port

 

7. Refer to the exhibit. Consider that the main power has just been restored. PC3 issues a broadcast IPv4 DHCP request. To which port will SW1 forward this request?

to Fa0/1 and Fa0/2 only

to Fa0/1 only

to Fa0/1, Fa0/2, Fa0/3, and Fa0/4

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

to Fa0/1, Fa0/2, and Fa0/4 only

 

8. What is the destination address in the header of a broadcast frame?

0.0.0.0

11-11-11-11-11-11

255.255.255.255

FF-FF-FF-FF-FF-FF

 

9. Which statement describes a result after multiple Cisco LAN switches are interconnected?

The broadcast domain expands to all switches.

Frame collisions increase on the segments connecting the switches.

One collision domain exists per switch.

There is one broadcast domain and one collision domain per switch.

 

10. Which type of address does a switch use to build the MAC address table?

destination MAC address

destination IP address

source MAC address

source IP address

 

11. Match the functions to the corresponding layers. (Not all options are used.)

Place the options in the following order:

Access layer

[+] represents the network edge

[+] provides network access to the user

Distribution layer

[#] implements network access policy

[#] establishes Layer 3 routing boundaries

Core layer

[*] provides high-speed backbone connectivity

[*] functions as an aggregator for all the campus blocks

 

12. 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 features of the hierarchical design make it the better choice? (Choose two.)

less required equipment to provide the same performance levels

simpler deployment for additional switch equipment

easier to provide redundant links to ensure higher availability

reduced cost for equipment and user training

lower bandwidth requirements

 

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

aggregating Layer 3 routing boundaries

aggregating all the campus blocks

acting as a backbone

providing access to end user devices

 

14. What is a collapsed core in a network design?

a combination of the functionality of the access and distribution layers

a combination of the functionality of the distribution and core layers

a combination of the functionality of the access and core layers

a combination of the functionality of the access, distribution, and core layers

 

15. Which network device can be used to eliminate collisions on an Ethernet network?

switch

firewall

router

hub

 

16. A local law firm is redesigning the company network so that all 20 employees can be connected to a LAN and to the Internet. The law firm would prefer a low cost and easy solution for the project. What type of switch should be selected?

StackPower

modular configuration

stackable configuration

StackWise

fixed configuration

 

17. Refer to the exhibit. How is a frame sent from PCA forwarded to PCC if the MAC address table on switch SW1 is empty?

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

SW1 drops the frame because it does not know the destination MAC address.

SW1 floods the frame on all ports on the switch, excluding the interconnected port to switch SW2 and the port through which the frame entered the switch.

SW1 forwards the frame directly to SW2. SW2 floods the frame to all ports connected to SW2, excluding the port through which the frame entered the switch.

 

18. Match the borderless switched network guideline description to the principle. (Not all options are used.)

Place the options in the following order:

allows intelligent traffic load sharing by using all network resources -> flexibility

facilitates understanding the role of each device at every tier, simplifies deployment, operation, management, and reduces fault domains at every tier -> hierarchical

allows seamless network expansion and integrated service enablement on an on-demand basis -> modularity

satisfies user expectations for keeping the network always on -> resiliency

 

19. What are two reasons a network administrator would segment a network with a Layer 2 switch? (Choose two.)

to create fewer collision domains

to create more broadcast domains

to eliminate virtual circuits

to isolate ARP request messages from the rest of the network

to enhance user bandwidth

to isolate traffic between segments

 

20. Refer to the exhibit. How many broadcast domains are displayed?

16

4

1

8

55

 

21. Which solution would help a college alleviate network congestion due to collisions?

a router with two Ethernet ports

a firewall that connects to two Internet providers

a high port density switch

a router with three Ethernet ports

 

22. Which network device can serve as a boundary to divide a Layer 2 broadcast domain?

access point

router

Ethernet hub

Ethernet bridge

 

23. What are two advantages of modular switches over fixed-configuration switches? (Choose two.)

need for fewer power outlets

lower forwarding rates

availability of multiple ports for bandwidth aggregation

lower cost per switch

increased scalability

 

24. Fill in the blank.

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

 

25. A small publishing company has a network design such that when a broadcast is sent on the LAN, 200 devices receive the transmitted broadcast. How can the network administrator reduce the number of devices that receive broadcast traffic?

Replace the switches with switches that have more ports per switch. This will allow more devices on a particular switch.

Add more switches so that fewer devices are on a particular switch.

Replace at least half of the switches with hubs to reduce the size of the broadcast domain.

Segment the LAN into smaller LANs and route between them.