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問答題問ip precedence有幾個bit？

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1.單項選擇題Before inserting a new switch in the network， the network administrator checks that the VTP domain name is correct， the VTP mode is set to server， and revision is lower than the switches in the network. The administrator then configures interfaces and trunks， erases existing VLANs， and connects the switch to the network. Following that procedure， there is no connectivity in the network. What is a possible cause of this problem？（）

A.Because the configuration revision of the new switches is lower than the rest of the network， it can change the VLAN database of the other switches.
B.As a VTP server， the new switch deleted all VLANs of the network.
C.Erasing VLANs increases the VTP configuration revision.
D.Since the configuration revision of the network is higher than the new switch， the VLAN database was automatically synchronized.

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2.多項選擇題The EtherChannel between your LAN switch and the Internet router is not load-balancing efficiently. On the switch， there are several workstations with valid IP ranges. Which load-balance algorithms can you use in the switch in order to optimize this load balancing？（）

A.source IP address
B.destination IP address
C.per-packet load balance
D.destination MAC address
E.source MAC address

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3.單項選擇題 Refer to the exhibit. What type of issue does this error log indicate if the IP address in the error log is located off of the Router A WAN?（）

A.HSRP standby configuration error
B.HSRP burned-in address error
C.HSRP secondary address configuration error
D.this is not an HSRP problem，but rather an STP error or router or switch configuration issue

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4.問答題 給了兩段documentation里的描述，問這個時候發(fā)哪種類型的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.

參考答案：ICMP類型5重定向消息。

5.多項選擇題 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.

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