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21.
Router R1 has two LAN interfaces and three serial interfaces enabled for IPv6. All
the interfaces use link-local addresses automatically generated by the router. Which
of the following could be the link-local address of R1’s interface S0/0?
- A.FEA0::200:FF:FE11:0
- B.FE80::200:FF:FE11:1111
- C.FE80::0213:19FF:FE7B:0:1
- D.FEB0::211:11FF:FE11:1111
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| When created automatically, link-local addresses begin FE80::/64, because after the prefix of FE80::/10, the device builds the next 54 bits as binary 0s. Statically assigned link-local addresses simply need to conform to the FE80::/10 prefix. As a result, only two answers are candidates with a beginning quartet of FE80. Of these, only one has only hex 0s in the second, third, and fourth quartets, making answer B the only valid answer. |
22.
Router R1 has the following configuration. Assuming that R1’s F0/0 interface has a
MAC address of 0200.0011.1111, what IPv6 addresses will R1 list for interface F0/0
in the output of the show ipv6 interface brief command? (Choose two.)
#interface f0/0
#ipv6 address 2345:0:0:8::1/64
#interface f0/0
#ipv6 address 2345:0:0:8::1/64
- A.2345:0:0:8::1
- B.2345:0:0:8:0:FF:FE11:1111
- C.FE80::FF:FE11:1111
- D.FE80:0:0:8::1
- Answer & Explanation
- Report
Answer : [A][C]
Explanation :
Explanation :
| The ipv6 address command does not list an eui-64 parameter, so R1 does not form its global unicast address using the EUI-64 format. However, it does form its link-local address using EUI-64. The show ipv6 interface brief command lists both the global unicast and link-local addresses in its output. |
23.
Router R1 lists the following output from a show command. Which of the following
is true about R1?
R1# show ipv6 interface f0/0 FastEthernet0/0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::213:19FF:FE12:3456 No Virtual link-local address(es): Global unicast address(es): 2000::4:213:19FF:FE12:3456, subnet is 2000:0:0:4::/64 [EUI] Joined group address(es): FF02::1 FF02::2 FF02::1:FF12:3456
- A.R1's solicited node multicast address is FF02::1:FF12:3456.
- B.R1's 2000::4:213:19FF:FE12:3456 address is a global unicast with all 128 bits statically configured.
- C.Address FF02::2 is R1’s solicited node multicast.
- D.R1's solicited node multicast, not listed in this output, would be FF02::213:19FF:FE12:3456.
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The group addresses listed in the output are the all IPv6 hosts address (FF02::1), the all IPv6 routers address (FF02::2), and the solicited node address that is based on R1’s global unicast address (FF02::1:FF12:3456). Also, R1’s global unicast address is listed correctly in answer B, but the “[EUI]” notation implies that R1 derived the interface ID portion using EUI-64 conventions. |
24.
Which of the following features work the same in both RIPv2 and RIPng? (Choose
three.)
- A.Distance Vector Logic
- B.Uses UDP
- C.Uses RIP-specific authentication
- D.Maximum useful metric of 15
- E.Automatic route summarization
- Answer & Explanation
- Report
Answer : [A][B],[D]
Explanation :
Explanation :
| RIPv2 and RIPng both use UDP, both use distance-vector logic, and both use the same metric, with the same maximum (15) and same metric that means infinity (16). RIPng does not perform automatic route summarization because IPv6 has no concept of a classful network. RIPng also uses the built-in IPv6 authentication mechanisms rather than a RIP-specific authentication such as RIPv2. |
25.
Router R1 currently has no configuration related to IPv6 or IPv4. The following
configuration exists in a planning document, intended to be used to copy/paste into
Router R1 to enable RIPng and IPv6 on interfaces Fa0/0 and S0/0/0. No other related
configuration exists. Which of the following is true about RIPng on R1 after this
configuration has been pasted into R1?
ipv6 unicast-routing interface fa0/0 ipv6 rip one enable ipv6 address 2000::1/64 interface s0/0/0 ipv6 address 2001::/64 eui-64 ipv6 rip one enable
- A.RIPng will be enabled on no interfaces.
- B.RIPng will be enabled on one interface.
- C.RIPng will be enabled on two interfaces.
- D.RIPng will advertise about prefixes connected to S0/0/0 and Fa0/0, but only send Updates on one interface.
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| The fact that the configuration will be copied/pasted into a router means that the order of the commands matters. In this case, the fact that the ipv6 rip one enable command precedes the ipv6 address command on interface f0/0 means that Cisco IOS will reject the first of these commands, therefore not enabling RIPng on F0/0. The correct order listed under S0/0/0 means that RIPng will be enabled on S0/0/0. As a result, RIPng on R1 will advertise about S0/0/0’s connected IPv6 prefixes, and send Updates on S0/0/0, but will do nothing related for F0/0. |
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