请教300-101两道选择题的正确答案

beiluochen

1、CCNP第267题
      QUESTION 267
     which three configuration parameters can a DHCPV6 pool contain? (choose three.)
    A. domain search list
    B. router IP
    C. default gateway
    D. prefix delegation
    E. DNS servers
    F. subnet mask
    Correct Answer: DEF

我看这个网站http://www.digitaltut.com/author/newcentury里面答案是ADE，解释的也很清楚


Explanation


A DHCPv6 configuration information pool is a named entity that includes information about available configuration parameters and policies that control assignment of the parameters to clients from the pool. A pool is configured independently of the DHCPv6 service and is associated with the DHCPv6 service through the command-line interface (CLI).
Each configuration pool can contain the following configuration parameters and operational information:
– Prefix delegation information, which could include:
+ A prefix pool name and associated preferred and valid lifetimes
+ A list of available prefixes for a particular client and associated preferred and valid lifetimes
– A list of IPv6 addresses of DNS servers
– A domain search list, which is a string containing domain names for DNS resolution
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/configuration/15-2mt/ipv6-15-2mt-book/ip6-dhcp.html
This is how to configure a DHCPv6 pool:
ipv6 unciast-routing
ipv6 dhcp pool <pool name>
address prefix <specify address prefix> lifetime <infinite> <infinite>
dns-server <specify the dns server address>
domain-name <specify the domain name>
For example:
ipv6 dhcp pool test
address prefix 2010:AA01:10::/64 lifetime infinite infinite
dns-server AAAA:BBBB:10FE:100::15
dns-server 2010:AA01::15
domain-name example.com
Reference: https://supportforums.cisco.com/document/116221/part-1-implementing-dhcpv6-stateful-dhcpv6
So we can see DHCPv6 pool supports address prefix and domain search list, DNS servers.


2、QUESTION 288
      Refer to the exhibit. Router DHCP is configured to lease IPv4 and IPv6 addresses to clients on ALS1 and ALS2. Clients on ALS2 receive IPv4 and IPv6          addresses. Clients on ALS1 receive IPv4 addresses. Which configuration on DSW1 allows clients on ALS1 to receive IPv6 addresses?
     A. DSW1 (config-if)# ipv6 helper address 2002:404:404::404:404
     B. DSW1 (config)#ipv6 route 2002:404:404::404:404/128 FastEthernet 1/0
     C. DSW1 (dhcp-config)# default-router 2002:A04:A01::A04:A01
     D. DSW1 (config)# ipv6 dhcp relay destination 2002:404:404::404:404 GigabitEthernet 1/2
     Correct Answer: C

http://www.digitaltut.com/author/newcentury答案为D，解释如下：

Explanation

In this topology DSW1 is the DHCPv6 Relayagent so it should relay (forward) the DHCPv6 Request packets (from theclients) out of its Gi1/2 interface to the DHCPv6 server. The command “ipv6dhcp relay destination …” is used to complete this task.

Note: There is no “default-router” command for DHCPv6. The“ipv6 dhcp relay destination” is not required to configure on every routeralong the path between the client and server. It is ONLY required on the routerfunctioning as the DHCPv6 relay agent.

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/enterprise-ipv6-solution/whitepaper_c11-689821.html

是否题库答案有误，请高手帮忙看一下，谢谢！

beiluochen

请大神帮忙看一下，马上要考试了，谢谢！