给了两段documentation里的描述，问这个时候发哪种类型的ICMP包。
The interface on which the packet comes into the router is the same interface on which the packet gets routed out.
The subnet or network of the source IP address is on the same subnet or network of the next-hop IP address of the routed packet.

【参考答案】

ICMP类型5重定向消息。

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多项选择题

Refer to the exhibit. Users from the Engineering VLAN complain that every time Business VLAN users have a network connectivity issue， the Engineering VLAN users usually have problems experiencing slow response or network connectivity problems. After troubleshooting， an unauthorized switch 2 was found. This unauthorized switch has been a regular problem， assuming the root bridge function under the spanning-tree domain and causing the Engineering VLAN to be unstable. Which three of these actions could be suggested to fix the problem？（）

A.Upgrade Spanning Tree Protocol to Rapid Spanning Tree Protocol.
B.Change Business VLAN PCs to switch 1 and switch 4.
C.Force the root bridge to be switch 2， instead.
D.Adjust spanning-tree timers （max-age and forward-delay）.
E.Shut down all unused ports.
F.Use MSTP to separate the Engineering VLAN from the Business VLAN to optimize spanning-tree convergence time within each VLAN.

问答题

什么是原子聚合？

单项选择题

Which of these best identifies the types of prefixes a router running BGP will advertise to an EBGP peer？（）

A.prefixes received from any other BGP peer and prefixes locally originated via network statements or redistributed to BGP
B.all prefixes in its IP routing table
C.only prefixes received from EBGP peers and prefixes locally originated via network statements or redistributed
D.only prefixes received from EBGP peers and prefixes received from route reflectors
E.all prefixes in its routing table except the prefixes received from other EBGP peers
F.all prefixes in its routing table except the prefixes received from other IBGP peers