CCNA Semester 2 chapter 4

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CCNA2 Chapter 4 V4.1

1. In an 8 bit binary number, what is the total number of combinations of the eight bits?

128
254
255
**256
512
1024


2. Convert the decimal number 231 into its binary equivalent. Select the correct answer from the list below.

11110010
11011011
11110110
**11100111
11100101
11101110


3. How many usable hosts are available given a Class C IP address with the default subnet mask?

**254
255
256
510
511
512


4. Which statement describes NAT overload or PAT?

Each internal address is dynamically translated to an individual external IP address.
A single internal address is always translated to the same unique external IP address.
**Many internal addresses can be translated to a single IP address using different port assignments.
Many internal addresses are statically assigned a single IP address and port to use for communications.


5. Which IPv4 class of addresses provides the most networks?

Class A
Class B
**Class C
Class D
Class E


6. Which statement accurately describes public IP addresses?

Public addresses cannot be used within a private network.
**Public IP addresses must be unique across the entire Internet.
Public addresses can be duplicated only within a local network.
Public IP addresses are only required to be unique within the local network.
Network administrators are free to select any public addresses to use for network devices that access the Internet.


7. Which two statements describe classful IP addresses? (Choose two.)

It is possible to determine which class an address belongs to by reading the first bit.
**The number of bits used to identify the hosts is fixed by the class of the network.
Only Class A addresses can be represented by high-order bits 100.
Up to 24 bits can make up the host portion of a Class C address.
**Up to 24 bits can be used to identify unique networks.
Three of the five classes of addresses are reserved for multicasts and experimental use.


8. Company XYZ uses a network address of 192.168.4.0. It uses the mask of 255.255.255.224 to create subnets. What is the maximum number of usable hosts in each subnet?

6
14
**30
62


9. hat is the network broadcast address for a Class C address of 192.168.32.0 with the default subnet mask?

192.168.0.0
192.168.0.255
192.168.32.0
192.168.32.254
**192.168.32.255


10. Refer to the exhibit. Host A is connected to the LAN, but it cannot get access to any resources on the Internet. The configuration of the host is shown in the exhibit. What could be the cause of the problem?

The host subnet mask is incorrect.
The default gateway is a network address.
The default gateway is a broadcast address.
**The default gateway is on a different subnet from the host.


11. IPv6 increases the IP address size from 32 bits to how many bits?

64
96
**128
192
256
512


12. What is the range of the first octet in a Class B address?

127 to 191
127 to 192
**128 to 191
128 to 192


13. Which IPv4 class provides the highest number of host addresses per network?

**Class A
Class B
Class C
Class D
Class E


14. refer to the exhibit. Which range of IP addresses would allow hosts that are connected to the Router1 Fa0/0 interface to access outside networks?

192.168.1.0 through 192.168.1.95
**192.168.1.66 through 192.168.1.94
192.168.1.66 through 192.168.1.96
192.168.1.0 through 192.168.1.127
192.168.1.66 through 192.168.1.128


15 Which option shows the proper notation for an IPv6 address?

2001,0db8,3c55,0015,abcd,ff13
2001-0db8-3c55-0015-abcd-ff13
2001.0db8.3c55.0015.abcd.ff13
**2001:0db8:3c55:0015::abcd:ff13


16. What are two reasons that NAT was developed? (Choose two.)

to preserve registered public IP addresses
to allow users on the public Internet to access local networks
**to provide a method for privately addressed LANs to participate in the Internet
to make routing protocols operate more efficiently
**to allow private addresses to be routed on the public Internet
to reduce overhead and CPU usage on gateway routers


17. What must happen for a privately addressed host on an inside local network to be able to communicate with an outside destination host on the Internet?

The host IP address must be translated to an outside private address.
The host IP address must be translated to an inside local address.
The host IP address must be translated to an outside local address.
**The host IP address must be translated to an inside global address.


18. Which port numbers are used by PAT to create unique global addresses?

255 and below
1024 and below
**1025 and above
64,000 and above


19. Static NAT works by mapping a specific inside local IP address to what other specific address type?

**inside global
outside local
outside global
private IP address


20. What are three advantages of NAT implementations? (Choose three.)

**improved security
improved router performance
decreased processor load
**improved scalability
universal application compatibility
**sharing few public IP addresses with many hosts more.

CCNA v4 - E2 - Module 4 (100/100)

1. A network administrator is evaluating RIP versus EIGRP for a new network. The network will be sensitive to congestion and must respond quickly to topology changes. What are two good reasons to choose EIGRP instead of RIP in this case? (Choose two.)

  EIGRP only updates affected neighbors.
  EIGRP updates are partial.

2. Which event will cause a triggered update?

  a route is installed in the routing table

3. Refer to the exhibit. If all routers are using RIP, how many rounds of updates will occur before all routers know all networks?

  3

4. Refer to the exhibit. The routers in this network are running RIP. Router A has not received an update from Router B in over three minutes. How will Router A respond?

  The Invalid timer will mark the route as unusable if an update has not been received in 180 seconds.

5. The graphic shows a network that is configured to use RIP routing protocol. Router2 detects that the link to Router1 has gone down. It then advertises the network for this link with a hop count metric of 16. Which routing loop prevention mechanism is in effect?

  route poisoning

6. Which two statements are true regarding the function of the RIPv1 routing updates? (Choose two).

  updates are broadcast at regular intervals
  broadcasts are sent to 255.255.255.255

7. What is the purpose of the TTL field in the IP header?

  limits the time or hops that a packet can traverse through the network before it should be discarded

8. Which three routing protocols are distance vector routing protocols? (Choose three).
  RIPv1
  EIGRP
  RIPv2

9. What metric does the RIP routing protocol consider to be infinity?

  16

10. Which two conditions are most likely to cause a routing loop? (Choose two.)

  inconsistent routing tables
  incorrectly configured static routes

11. What does the RIP holddown timer do?

  instructs routers to ignore updates, for a specified time or event, about possible inaccessible routes

12. Which of the following can exist in a distance vector network that has not converged? (Choose three.)

  routing loops
  inconsistent traffic forwarding
  inconsistent routing table entries

13. Refer to the exhibit. What path will packets from the 192.168.1.0/24 network travel to reach the 10.0.0.0/8 network if RIP is the active routing protocol?

  The path will be router A -> router D -> router E.

14. What is a routing loop?

  a condition where a packet is constantly transmitted within a series of routers without ever reaching its intended destination

15. Which of the following methods does split horizon use to reduce incorrect routing information?

  Information learned from one source is not distributed back to that source.

16. Which statement is true regarding cisco’s RIP_JITTER variable?

  It prevents the synchronization of routing updates by subtracting a random length of time ranging from 0% to 15% of the specified interval time from the next routing update interval.

17. Which of the following statements are correct about RIP?

  will send out an update if there is a failure of a link

18. What actions will occur after RouterA loses connectivity to network 114.125.16.0? (Choose two.)

  RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA.
  Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.

19. Three routers running a distance-vector routing protocol lost all power, including the battery backups. When the routers reload, what will happen?

  They will send updates that include only directly connected routes to their directly connected neighbors.

20. Which two statements describe EIGRP? (Choose two.)

  EIGRP sends triggered updates whenever there is a change in topology that influences the routing information.
  EIGRP sends a partial routing table update, which includes just routes that have been changed.

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more.

CCNA 2 - Module 4

Which event will cause a triggered update?

a route is installed in the routing table



Three routers running a distance-vector routing protocol lost all power, including the battery backups. When the routers reload, what will happen?

They will send updates that include only directly connected routes to their directly connected neighbors.



What does the RIP holddown timer do?

instructs routers to ignore updates, for a specified time or event, about possible inaccessible routes


Which two statements are true regarding the function of the RIPv1 routing updates? (Choose two).

updates are broadcast at regular intervals broadcasts are sent to 255.255.255.255


Which of the following statements are correct about RIP?

will send out an update if there is a failure of a link



Which two statements describe EIGRP? (Choose two.)

EIGRP sends triggered updates whenever there is a change in topology that influences the routing information. EIGRP sends a partial routing table update, which includes just routes that have been changed.



Which statement is true regarding cisco’s RIP_JITTER variable?

It prevents the synchronization of routing updates by subtracting a random length of time ranging from 0% to 15% of the specified interval time from the next routing update interval.


What actions will occur after RouterA loses connectivity to network 114.125.16.0? (Choose two.)

RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA. Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.



Which of the following methods does split horizon use to reduce incorrect routing information?

Information learned from one source is not distributed back to that source.


The graphic shows a network that is configured to use RIP routing protocol. Router2 detects that the link to Router1 has gone down. It then advertises the network for this link with a hop count metric of 16. Which routing loop prevention mechanism is in effect?

route poisoning

What is the purpose of the TTL field in the IP header?

limits the time or hops that a packet can traverse through the network before it should be discarded

Which of the following can exist in a distance vector network that has not converged? (Choose three.)

routing loops inconsistent traffic forwarding inconsistent routing table entries



Refer to the exhibit. The routers in this network are running RIP. Router A has not received an update from Router B in over three minutes. How will Router A respond?

The Invalid timer will mark the route as unusable if an update has not been received in 180 seconds.

A network administrator is evaluating RIP versus EIGRP for a new network. The network will be sensitive to congestion and must respond quickly to topology changes. What are two good reasons to choose EIGRP instead of RIP in this case? (Choose two.)

EIGRP only updates affected neighbors. EIGRP updates are partial.

Refer to the exhibit. What path will packets from the 192.168.1.0/24 network travel to reach the 10.0.0.0/8 network if RIP is the active routing protocol?

The path will be router A -> router D -> router E.

Which three routing protocols are distance vector routing protocols? (Choose three).

RIPv1 EIGRP RIPv2



What is a routing loop?

a condition where a packet is constantly transmitted within a series of routers without ever reaching its intended destination


Which two conditions are most likely to cause a routing loop? (Choose two.)

inconsistent routing tables incorrectly configured static routes


What metric does the RIP routing protocol consider to be infinity?

16



What does a router running RIP do first with a new route that is received from an advertisement?

adjusts the metric for the new route to show the added distance for the route

Refer to the exhibit. If all routers are using RIP, how many rounds of updates will occur before all routers know all networks?
3 more.

CCNA 2 - Module 4

Which event will cause a triggered update?

a route is installed in the routing table



Three routers running a distance-vector routing protocol lost all power, including the battery backups. When the routers reload, what will happen?

They will send updates that include only directly connected routes to their directly connected neighbors.



What does the RIP holddown timer do?

instructs routers to ignore updates, for a specified time or event, about possible inaccessible routes


Which two statements are true regarding the function of the RIPv1 routing updates? (Choose two).

updates are broadcast at regular intervals broadcasts are sent to 255.255.255.255


Which of the following statements are correct about RIP?

will send out an update if there is a failure of a link



Which two statements describe EIGRP? (Choose two.)

EIGRP sends triggered updates whenever there is a change in topology that influences the routing information. EIGRP sends a partial routing table update, which includes just routes that have been changed.



Which statement is true regarding cisco’s RIP_JITTER variable?

It prevents the synchronization of routing updates by subtracting a random length of time ranging from 0% to 15% of the specified interval time from the next routing update interval.


What actions will occur after RouterA loses connectivity to network 114.125.16.0? (Choose two.)

RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA. Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.



Which of the following methods does split horizon use to reduce incorrect routing information?

Information learned from one source is not distributed back to that source.


The graphic shows a network that is configured to use RIP routing protocol. Router2 detects that the link to Router1 has gone down. It then advertises the network for this link with a hop count metric of 16. Which routing loop prevention mechanism is in effect?

route poisoning

What is the purpose of the TTL field in the IP header?

limits the time or hops that a packet can traverse through the network before it should be discarded

Which of the following can exist in a distance vector network that has not converged? (Choose three.)

routing loops inconsistent traffic forwarding inconsistent routing table entries



Refer to the exhibit. The routers in this network are running RIP. Router A has not received an update from Router B in over three minutes. How will Router A respond?

The Invalid timer will mark the route as unusable if an update has not been received in 180 seconds.

A network administrator is evaluating RIP versus EIGRP for a new network. The network will be sensitive to congestion and must respond quickly to topology changes. What are two good reasons to choose EIGRP instead of RIP in this case? (Choose two.)

EIGRP only updates affected neighbors. EIGRP updates are partial.

Refer to the exhibit. What path will packets from the 192.168.1.0/24 network travel to reach the 10.0.0.0/8 network if RIP is the active routing protocol?

The path will be router A -> router D -> router E.

Which three routing protocols are distance vector routing protocols? (Choose three).

RIPv1 EIGRP RIPv2



What is a routing loop?

a condition where a packet is constantly transmitted within a series of routers without ever reaching its intended destination


Which two conditions are most likely to cause a routing loop? (Choose two.)

inconsistent routing tables incorrectly configured static routes


What metric does the RIP routing protocol consider to be infinity?

16



What does a router running RIP do first with a new route that is received from an advertisement?

adjusts the metric for the new route to show the added distance for the route

Refer to the exhibit. If all routers are using RIP, how many rounds of updates will occur before all routers know all networks?
3 more.