Ensurepass

QUESTION 131

An administrator is working with the 192.168.4.0 network, which has been subnetted with a /26 mask. Which two addresses can be assigned to hosts within the same subnet? (Choose two.)

 A. 192.168.4.61 B. 192.168.4.63 C. 192.168.4.67 D. 192.168.4.125 E. 192.168.4.128 F. 192.168.4.132

Explanation:

Increment: 64 (/26 = 11111111.11111111.11111111.11000000) The IP 192.168.4.0 belongs to class

C.The default subnet mask of class C is /24 and it has been subnetted with a /26 mask so we have 2(26-24) = 22 = 4 sub-networks:

1st subnet: 192.168.4.0 (to 192.168.4.63)

2nd subnet: 192.168.4.64 (to 192.168.4.127)

3rd subnet: 192.168.4.128 (to 192.168.4.191)

4th subnet: 192.168.4.192 (to 192.168.4.225)

In all the answers above, only answer C and D are in the same subnet. Therefore only IPs in this range can be assigned to hosts.

QUESTION 132

Which IOS command is used to initiate a login into a VTY port on a remote router?

 A. router# login B. < font face="Arial">router# telnet C. router# trace D. router# ping E. router(config)# line vty 0 5 F. router(config-line)# login

Explanation:

VTY ports are telnet ports hence command B will initiate login to the telnet port.

QUESTION 133

 A. 224.0.0.5 B. 172.16.0.1 C. 192.168.0.5 D. 223.0.0.1 E. 254.255.255.255

Explanation:

Why does the show ip ospf neighbor Command Reveal Neighbors in the Init State?

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f11.shtml

OSPF hello packets have a destination address of 224.0.0.5 (the all ospf routers multicast address).

QUESTION 134

 A. 172.19.20.0 B. 172.19.20.15 C. 172.19.20.16 D. 172.19.20.20 E. 172.19.20.32

Explanation:

From the /28 we can get the following:

Increment: 16 (/28 = 11111111.11111111.11111111.11110000)

Network address: 172.19.20.16 (because 16 < 23)

QUESTION 135

What two things does a router do when it forwards a packet? (Choose two.)

 A. switches the packet to the appropriate outgoing interfaces B. computes the destination host address C. determines the next hop on the p ath D. updates the destination IP address E. forwards ARP requests

Explanation:

A primary function of a router is to forward packets toward their destination. This is accomplished by using a switching function, which is the process used by a router to accept a packet on one interface and forward it out of another interface. A key responsibility of the switching function is to encapsulate packets in the appropriate data link frame type for the outgoing data link and determining the next hop device to send the frame to.

QUESTION 136

Refer to the exhibit. When running OSPF, what would cause router A not to form an adjacency with router B?

 A. The loopback addresses are on different subnets. B. The values of the dead timers on the routers are different. C. Route summarization is enabled on both routers. D. The process identifier on router A is different than the process identifier on router B.

Explanation:

To form an adjacency (become neighbor), router A & B must have the same Hello interval, Dead interval and AREA numbers.

QUESTION 137

What is the subnet address of 172.16.159.159/22?

 A. 172.16.0.0 B. 172.16.128.0 C. 172.16.156.0 D. 172.16.159.0 E. 172.16.159.128 F. 172.16.192.0

Explanation:

Converting to binary format it comes to 11111111.11111111.11111100.00000000 or 255.255.252.0 Starting with 172.16.0.0 and having increment of 4 we get.

QUESTION 138

What is the network address for the host with IP address 192.168.23.61/28?

 A. 192.168.23.0 B. 192.168.23.32 C. 192.168.23.48 D. 192.168.23.56 E. 192.168.23.60

Explanation:

Convert bit-length prefix to quad-dotted decimal representation, then from it find the number of bits use
d for subnetting you can find previously calculated number of subnets by separating subnets each having value of last bit used for subnet masking Find that your IP address is in which subnet, that subnet’s first address is network address and last address is broadcast address.

Based on above steps the answer is option C.

QUESTION 139

Given a Class C IP address subnetted with a /30 subnet mask, how many valid host IP addresses are available on each of the subnets?

 A. 1 B. 2 C. 4 D. 8 E. 252 F. 254

Explanation:

/30 CIDR corresponds to mask 55.255.255.252 whose binary is 11111100 which means 6 subnet bits and 2 host bits which means 62 subnets and 2 hosts per subnet.

QUESTION 140

Scenario

Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links. You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices. An OSPF neighbor adjacency is not formed between R3 in the main office and R5 in the Branch2 office. What is causing the problem?

 A. There is an area ID mismatch. B. There is a PPP authentication issue; a password mismatch. C. There is an OSPF hello and dead interval mismatch. D. There is a missing network command in the OSPF process on R5.

Explanation:

The “show ip ospf interface command on R3 and R5 shows that the hello and dead intervals do not match. They are 50 and 200 on R3 and 10 and 40 on R5.

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