Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 143.  B.  The global unicast address is defined as 2000::/3. This provides a valid range of 2000:: 

to 3fff::. An address with a network prefix of fe80::/10 is a link-local address. An address 

with a network prefix of fc00::/7 is a unique local unicast address. An address with a 

network prefix of ff00::/8 is a multicast address.

 144.  A.  The first 23 bits are allotted to the ISP by the RIR for the region of the world for which 

the ISP is requesting the prefix. All of the other options are incorrect.

 145.  C.  The unique local address is defined as fc00::/7. Unique local addresses have replaced 

site-local addresses as of 2004 and are non-routable. The valid IPv6 range is fc00:: to 

fd00:: despite IANA reserving fc00::/7 as the fc00:: range. The range should not be used 

since the 8th bit is considered the “local bit” and is required to be a 1, as in, for example, 

1111 1101 = fd. An address with a network prefix of fe80::/10 is a link-local address. An 

address with a network prefix of 2000::/3 is a unique local unicast address. An address 

with a network prefix of ff00::/8 is a multicast address.

 146.  A.  IPv4 RFC 1918 addresses are defined as private non-routable IP addresses. In IPv6, 

link-local addresses are the equivalent to RFC 1918 addresses and are non-routable. 

Global unicast addresses are similar to IPv4 public IP addresses. An EUI-64 address is 

the host interface portion of the IPv6 address when it is configured using the host’s MAC 

address. Anycast addresses are IPv6 addresses that are applied to multiple hosts and 

routed to the hosts based upon proximity; root DNS servers use anycast in this manner.

 147.  A.  The link-local address is defined as fe80::/10. Any address starting with fe80 is non-

routable. A global unicast address is defined as 2000::/3. This provides a valid range of 

2000:: to 3fff::. An address with a network prefix of fc00::/7 is a unique local unicast 

address. The network address of fd00 would be part of the fc00::/7 network range. An 

address with a network prefix of ff00::/8 is a multicast address.

 148.  D.  Anycast is a way of allowing the same IP address on multiple machines in different 

geographical areas. The routing protocol is used to advertise in routing tables the closest 

IP by the use of metrics. Currently this is how DNS root servers work. A unicast address 

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

broadcast will forward a message to all computers in the same subnet. A multicast address 

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

 149.  D.  The command to configure an anycast address on an interface would be 

ipv6 address 

2001:db8:1:1:1::12/128 anycast. The /128 defines a single IP address to advertise in 

routing tables. The command 

ip address 2001:db8:1:1:1::12/64 is incorrect. The 

command 

ipv6 address 2001:db8:1:1:1::12/64 anycast is incorrect. The command 

ipv6 anycast address 2001:db8:1:1:1::12/128 is incorrect.

 150.  C.  Multicast is used to allow computers to opt into a transmission. Examples of uses 

for multicast are video, routing protocols, and imaging of computers to name a few. A 

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

two hosts. A broadcast will forward a message to all computers in the same subnet. A 

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

Anycast is a way of allowing the same IP address on multiple machines in different 

geographical areas. The routing protocol is used to advertise in routing tables the closest 

IP by the use of metrics.

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Chapter 1: Network Fundamentals (Domain 1)