300-101,题库里有一道拖图题有问题，ip dhcp relay information
这是题库里的答案。后面的标注是我做的。
1. ip dhcp relay information subscriber-id: add sub option and the remote ID sub option //似乎是option
2. ip dhcp relay information: verify relay information option (in forwarded BOOTREPLY) //应该是check
3. ip dhcp relay information check: define reforwarding rules (for a DHCP relay agent) //应该是policy
4. ip dhcp relay information option: enable a service provider to add a unique ID //可能是subscriber-id,GNS3没有这个选项。
5. ip dhcp relay information policy: configured in global configuration mode applies to allinterfaces //可能不写参数。GNS3没有这个选项。
这是在GNS3上显示的情况：
(config)#ip dhcp relay information ?
check: validate relay information in BOOTRELAY
option: insert relay information in BOOTREQUEST
policy: define reforwarding policy
查了一下 思科的命令，题库答案应该没错。
链接如下： https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/15-sy/dhcp-15-sy-book/dhcp-relay-agent.html
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