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QUESTION 85
You have the binary IP address, {11000000.10100100.11000000.00000001 }. What class of IP address is it, and what is a characteristic of that class?
A. It is a Class B public address.
B. It is a Class C public address.
C. It is a Class B private address
D. It is a Class C private address.
E. It is a Class D experimental address.

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
11000000.10100100.11000000.00000001 = 192.164.192.1 = A public Class C address
Incorrect Answers:
A, C: Class B addresses begin with a “10” in the first octet.

D. Class C private (RFC 1918) addresses are in the IP range 192.168.0.0-192.168.255.255 Reference: Building Scalable Cisco Networks (Cisco Press) page 66
QUESTION 86
You are the network administrator at Certkiller . Certkiller is assigned a network of 200.10.5.0/24. You want to create 5 subnets from the assigned address. Which subnet mask will give you 5 subnets and the most possible hosts per subnet?
A. /21
B. /23
C. /26
D. /27
E. /29

Correct Answer: D Section: (none) Explanation Explanation/Reference:
Explanation:
We need 5 subnets from the given address 200.10.5.0/24. It means we will do 3 bits of
subnetting which will provide us 8 subnets as 2N = 23 =8 subnets where n=number of subnet bits.
So, we will have a total of 24+3 = 27 network bits.

QUESTION 87
You are the network engineer at Certkiller . Certkiller has a branch office with five devices that require
public IP addresses.
Which of the following subnet masks will provides the most efficient allocation of addresses?

A. 255.255.255.128
B. 255.255.255.248
C. 255.255.255.252
D. 255.255.255.254

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: Requirement = 5 public IP addresses to connect 5 devices 3-bits of subnetting in the host portion will provide 23= 8 addresses. After we subtract 2 of these addresses, for the network and broadcast IP address, we are still left with 6 useable IP addresses for each network.
QUESTION 88
Which three are characteristics of IPv6? Select three.
A. An IPv6 address is 128 bits long.
B. An IPv6 header is 20 bits long.
C. An IPv6 header contains the next header field.
D. An IPv6 header contains the next protocol field.
E. IPv6 routers send RA messages.
F. An IPv6 header contains the header checksum field.

Correct Answer: ACE Section: (none) Explanation
Explanation/Reference:
Explanation: In IPv6, the 128 bit IP address is separated to two: network prefix, which identifies network, and interface ID, which identifies a node (interface). Interface ID is configured by the node on its own, and prefix is notified by the network (usually router). These two are combined to form an IPv6 address. IPv6 packet headers contain many of the fields found in IPv4 packet headers; some of these fields have been modified from IPv4. The next header field is the next extension header to examine. This was previously the protocol field in IPv4. RA stands for router advertisements, used by IPv6 routers for the purpose of automatic address configuration.
QUESTION 89
Which address type does the IPv6 address FF05:0:0:0:0:0:0:2 specify?
A. unspecified
B. aggregable glocal unicast
C. link local
D. site local unicast
E. multicast Answer: E Explanation: All IPv6 multicast addresses start with the first 8 bits of the address set to 1. Thus all multicast addresses start with the hexadecimal notation FF (1111 1111). The multicast range is as follows: FF00::/8 FFFF::/8 The second octet, following to the first octet of FF, identifies both the scope and the lifetime of the multicast address. In this way, IPv6 has millions of group multicast addresses to use in current and emerging technologies. Reference: CCNP Self-Study CCNP BSCI Exam Certification Guide p.112

Correct Answer: Section: (none) Explanation
QUESTION 90
Which command must be globally enabled on a Cisco router to support IPv6?
A. ip routing ipv6
B. ipv6 unicast routing
C. ipv6 routing
D. ip classless
E. ipv6 cef

Correct Answer: B Section: (none) Explanation
QUESTION 91
Route aggregation is a way of reducing the number of entries in a routing table. Three of the routing protocols below support automatic route summarization. Which ones are they? (Select three)
A. IS-IS
B. EIGRP
C. OSPF
D. IGRP
E. RIP v.1

Correct Answer: BDE Section: (none) Explanation
Explanation/Reference:
Explanation:
B: IGRP automatically summarize routes on the class network boundary.

D: EIGRP support both manual and automatic route summarization.

E: RIPv1 automatically summarize routes on the class network boundary.
Incorrect Answers:
A, C: IS-IS and OSPF only support manual route summarization.

QUESTION 92
The Certkiller network consists of the following IP subnets: How many CIDR blocks will be needed to summarize these subnets in the Certkiller network?

A. Two
B. Three
C. Four
D. Five
E. None of the above

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: To properly summarize 10 contiguous networks, they will have to broken into three separate advertisements: one will consist of 8 subnets (the middle eight) and the other two will consist of the first and last subnets. The summarizations are as follows: 192.168.31.0/24 192.168.32.0/21 192.168.40.0/24 Reference: Building Scalable Cisco Networks (Cisco Press) page 85
QUESTION 93
You are in the process of manually summarizing some routes within your network. Which of the addresses below would be included in the manual route summarization of 153.25.200.0/21?
A. 153.25.198.0
B. 153.25.206.0
C. 153.25.208.0
D. 153.25.224.0
Correct Answer: B Section: (none) Explanation

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Cisco 642-801 Exam Download, Easily To Pass Cisco 642-801 Demo Is What You Need To Take