Ccna certification Practice Tests

 127.  C.  An IPv6 address is 128 bits: 64 bits is the network ID, and 64 bits is the host ID. All of 

the other options are incorrect.

 128.  D.  A 6to4 tunnel can be achieved between the routers. This encapsulates the IPv6 header 

in an IPv4 header so that it can be routed across the Internet. A dedicated leased line and 

Frame Relay are wide area network (WAN) connectivity methods. Dual stack means 

that a host or router will have both IPv4 and IPv6 configured, but it will not allow both 

facilities to communicate over the Internet.

 129.   D.  In order to enable IPv6 on a router, you must globally configure the router with the 

command 

ipv6 unicast-routing. Although ipv6 enable will work, it will allow only 

link-local addressing. The command 

ipv6 address is incorrect. The command ipv6 

routing is incorrect.

 130.  D.  When you configure routers, always use the rule of major/minor. The major protocol 

is 

ipv6, and the minor command is address. So the correct command is ipv6 address 

2001:0db8:85aa:0000:0000:8a2e:1343:1337/64. The additional rule is to specify the 

network portion with a /64. The command 

ip address 2001:0db8:85aa:0000:0000: 

8a2e:1343:1337 is incorrect. The command ipv6 address 2001:0db8:85aa:0000:000

0:8a2e:1343:1337 is incorrect. The command ip address 2001:0db8:85aa:0000:000

0:8a2e:1343:1337/64 is incorrect.

 131.  A.  The first 4 bits of an IPv6 header contain the version number. In an IPv4 packet, this 

is set to 0100, but in an IPv6 packet, this number is set to 0110. This allows for the host 

to decide which stack to process the packet in. Flow labels in IPv6 explain to a router how 

to handle packets and route them; they do not contain a version number. The source and 

destination addresses in IPv6 packets will be IPv6 addresses, but this is not how a dual 

stack machine decides which protocol to use.

 132.  A.  When you use a show command, always follow it with the major protocol and then 

the parameters. The 

show ipv6 interfaces brief command would show all of the 

interfaces configured with an IPv6 address. The command 

show ip interfaces brief is 

incorrect. The command 

show interfaces status is incorrect. The command show ip 

addresses is incorrect.

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Chapter 1: Network Fundamentals (Domain 1)