Ccna certification Practice Tests

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 133.  D.  You can remove leading 0s in the quartet, and you can condense four zeros 

to one zero. However, you can use the :: to remove zeros only once. Therefore, 

2001:db8:0000::8a2e::1337 and 2001:db8::8a2e::1337 are invalid notations. The address 

2001:db8:::8a2e:0000:1337 contains three colons, and therefore, it is an invalid notation.

 134.  C.  Expanding out the IP of 2001::0456:0:ada4, you first expand the :0: to four zeros. 

Then expand the remainder of the quartets to 0s to make a 32-digit (128-bit) number 

again. All other options are incorrect.

 135.  B.  The first 48 bits of an IPv6 address are the global prefix; the next 16 bits are the subnet 

portion of the IPv6 address. 48 bits + 16 bits = 64 bits for the network ID. 1234 is the site 

ID, which is a portion of the network ID. 0023 is the first 16 bits of the interface ID. 8080 

is the second 16 bits of the interface ID.

 136.  A.  The network prefix is 2001:db8::/64. Expanded, it is written as 

2001:0db8:0000:0000/64. However, the condensed version written in the answer is valid. 

All of the other options are incorrect.

 137.  C.  The command to ping an IPv6 address is 

ping ipv6. The valid condensed address for 

fc00:0000:0000:0000:0000:0000:0000:0004 is fc00::4. You cannot condense trailing 

zeros such as fc00. You can only condense leading zeros. The command 

ping in options 

A and B is incorrect; the proper command is 

ping ipv6 for IPv6 addresses. Although the 

command 

ping ipv6 is correct, the IP address in option D is incorrect.

 138.  A.  A unicast address is a single valid IP address for direct communications purposes 

between two hosts. A broadcast is a single address that is sent to a network of hosts. A 

multicast address is a single address that is selectively sent to a multicast group of hosts. 

An anycast address is a single IP address that is selectively routed to depending on the 

location of the originating host.

 139.  B.  DHCP uses a packet called a Discover packet. This packet is addressed to 

255.255.255.255. Although ARP uses a broadcast, it is a layer 2 broadcast, not a layer 3 

broadcast. IGMP is a layer 3 protocol that uses unicast to register members of a multicast 

group. SNMP is a layer 3 management protocol that uses unicasts for messaging.

 140.  B.  A broadcast will forward a message to all computers in the same subnet. A unicast 

address is a single valid IP address for direct communications purposes between two 

hosts. A multicast address is a single address that is selectively sent to a multicast group of 

hosts. An anycast address is a single IP address that is selectively routed to depending on 

the location of the originating host.

 141.  B.  The answer is 16,384 networks. You subtract 34 bits from 48 bits = 14 bits, then 2

14

 = 

16,384. All of the other options are incorrect.

 142.  A.  The Neighbor Discovery Protocol (NDP) uses Neighbor Solicitation (NS) and 

Neighbor Advertisement (NA) messages to look up an IP address from a MAC address 

through the use of multicast messages. Duplicate Address Detection (DAD) uses Neighbor 

and Neighbor Advertisement (NA) messages to check if another host has the same IPv6 

address. Stateless Address Autoconfiguration (SLAAC) uses Router Solicitation (RS) 

and Router Advertisement (RA) to assign a network ID to a host. The ARP protocol is 

completely removed from IPv6; therefore ARPv6 is not a valid answer.

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