Ccna certification Practice Tests

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 151.  D.  The multicast address is defined as ff00::/8. Multicast addresses always start with 

ff. 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 fd00 would be part of the fc00::/7 network range.

 152.  A.  When converting a MAC address to an EUI-64 host address, the first step is to split the 

MAC address into 6-byte sections of f42356 and 345623 and place fffe in between them, 

f423:56ff:fe34:5623. This gives you a 64-bit value comprised of a 48-bit MAC address 

and a 16-bit filler. You must then invert (flip) the 7th bit. Example: f4 = 1111 0100 = 

flipped = 1111 0110 = f6. All of the other options are incorrect.

 153.  C.  The EUI-64 address can always be found by looking at the last 64 bits. In between the 

last 64 bits of the address, you will always find fffe. For example, the last 64 bits of the 

address of 2001:db8:aa::f654:56ff:fe34:a633 are f654:56ff:fe34:a633. All other options 

are incorrect.

 154.  C.  The command to set an EUI-64 address for the host portion of the IPv6 address  

on an interface is 

ipv6 address 2001:db8:1234::/64 eui-64. The command  

ip address eui-64 2001:db8:1234::/64 is incorrect. The command  

ip address 2001:db8:1234::/64 mac-address is incorrect. The command  

ipv6 address 2001:db8:1234::/64 mac is incorrect.

 155.  C.  The command 

ipconfig /all will help you verify the IP address, subnet mask, 

default gateway, and MAC address of your computer. The command 

ipconfig doesn’t 

show the MAC address. The 

ipconfig command will give brief information about the 

interfaces on the Windows host. The command 

ipstatus is not a valid command. The 

command 

hostname will display the name of the Windows host.

 156.  A.  The Windows command for tracing a route is 

tracert. The command  

ping 198.78.34.2 will send ICMP packets to the destination host of 198.78.34.2 and 

report the round-trip time. The command 

traceroute 198.78.34.2 is a Linux/Unix 

command for verifying the path on which a packet is routed. The command 

route print 

is used to view the routing table on a Windows host.

 157.  B.  If the cache is cleared after the change has been made to DNS and you still get the 

same IP address, the reason is most likely that there is a host entry configured. The 

command 

show running-config will show you if there is an entry. The router is not 

likely to be configured to the wrong DNS server because the authoritative domain  

of sybex.com is used. The DNS administrator could have made an error, but it  

resolves correctly on your laptop. The domain name is not the problem because it resolves 

correctly on your laptop.

 158.  C.  The command 

nslookup routerb.sybex.com will allow you to positively verify 

name resolution. The 

ping command should not be used because the failure of ICMP 

echo will make the command fail, giving you a false result. The 

tracert command is used 

for tracing the route a packet takes, and like 

ping it can give a false positive if the host is 

unreachable. The 

dig command is a great tool to use in place of nslookup for verifying 

DNS, but it is not installed on Windows by default.

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