CCNA 2 Chapter 1

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

• has a positive impact on bandwidth by dropping most of the invalid frames
• makes a fast forwarding decision based on the source MAC address of the frame
• has a lower latency appropriate for high-performance computing applications​*
• provides the flexibility to support any mix of Ethernet speeds

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

• reduced cost for equipment and user training
• less required equipment to provide the same performance levels
• simpler deployment for additional switch equipment*
• easier to provide redundant links to ensure higher availability*
• lower bandwidth requirements

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

• availability of multiple ports for bandwidth aggregation
• lower forwarding rates
• need for fewer power outlets*
• lower cost per switch
• increased scalability*

4. Refer to the exhibit. 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?​ 

• to Fa0/1, Fa0/2, and Fa0/4 only​
• to Fa0/1, Fa0/2, Fa0/3, and Fa0/4
• to Fa0/1 and Fa0/2 only
• to Fa0/1, Fa0/2, and Fa0/3 only*
• to Fa0/1 only​

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

• forwards data based on logical addressing
• learns the port assigned to a host by examining the destination MAC address
• duplicates the electrical signal of each frame to every port
• determines which interface is used to forward a frame based on the destination MAC address*

6. Refer to the exhibit. Fill in the blank.
There are ” 12 ” collision domains in the topology.​ 

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

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

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

• to enhance user bandwidth*
• to eliminate virtual circuits
• to create more broadcast domains
• to isolate traffic between segments*
• to isolate ARP request messages from the rest of the network
• to create fewer collision domains

9. 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 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.
• 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 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.

10. Place the options in the following order: 
[+] appropriate for high performance computing applications 
[+] forwarding process can begin after receiving the destination address 
[+] may forward invalid frames 
[#] error checking before forwarding 
[#] forwarding process only begin after receiving the entire frame 
[#] only forward valid frames

[+] Order does not matter within this group.
[#] Order does not matter within this group.

11. 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 the user

12. 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? 

• hub 
• host
• NIC
• switch*

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

• the numbers of hosts that are connected to each switch port
• the speed of each port
• the memory space that is allocated to each switch port
• the number of available ports*

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

• anycast
• unicast
• broadcast*
• multicast

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

• aggregates Layer 3 routing boundaries
• provides high availability
• aggregates Layer 2 broadcast domains
• provides access to the user*

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

• source MAC address and incoming port number*
• destination MAC address and incoming port number
• destination IP address and incoming port number
• source IP address and incoming port number

17. Fill in the blank. A     “converged”     network is one that uses the same infrastructure to carry voice, data, and video signals.

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

• t enables many switches to be connected with a special fiber-optic power cable to provide higher bandwidth.
• It enables the sharing of power among multiple stackable switches.*
• It enables many switches to be connected to increase port density.
• It enables many switches to be physically stacked in an equipment rack.
• It enables AC power for a switch to be provided from a powered patch panel.

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

• fixed-configuration switch
• modular switch
• stackable switch*
• rackable 1U switch

20. Refer to the exhibit. Fill in the blank. There are     ”  5  ”   broadcast domains in the topology.​

 NEW QUESTIONS 

21. What tool is important to consider for use when making hardware improvement decisions about switches? 

• switched virtual interfaces
• authentication servers
• multilayer switching
• traffic flow analysis*

22. What is the maximum wire speed of a single port on a 48-port gigabit switch? 

• 1000 Mb/s*
• 48 Mb/s
• 48 Gb/s
• 100 Mb/s

23. When the installation of a network infrastructure is being planned, which technology will allow power to be provided via Ethernet cabling to a downstream switch and its connected devices? 

• PoE pass-through*
• Gigabit Ethernet
• wireless APs and VoIP phones
• PoE

24. Match the function to the corresponding switch type. (Not all options are used.) 

Layer 2 switches
[+] typically used in the access layer of a switched network
[+] forward traffic based on information in the Ethernet header

Multilayer switches
[#] can build a routing table
[#] supports a few routing protocols

New question:

match the forwarding characterictic to its type.(Not all options are used.)

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

What tool is important to consider for use when making hardware improvement decisions about switches? 

• switched virtual interfaces
• authentication servers
• multilayer switching
• traffic flow analysis*

What is the maximum wire speed of a single port on a 48-port gigabit switch? 

• 1000 Mb/s*
• 48 Mb/s
• 48 Gb/s
• 100 Mb/s

When the installation of a network infrastructure is being planned, which technology will allow power to be provided via Ethernet cabling to a downstream switch and its connected devices? 

• PoE pass-through*
• Gigabit Ethernet
• wireless APs and VoIP phones
• PoE