In which Spanning-Tree states does a switch port learn MAC addresses? (Select two)

A．Blocking

B．Listening

C．Forwarding

D．Learning

E．Relaying

[单选题]What is the purpose of the Spanning Tree Protocol (STP)?A．To prevent routing loopsB．To create a default routeC．To provide multiple gateways for hostsD．To maintain a loop-free Layer 2 network topologyE．To enhance the functions of SNMP

[单选题]命令“spanning-tree vlan”的功能是()。A．Catalyst3500系统下启用STPB．Catalyst6500系统下启用STPC．Catalyst3500系统下配置生成树优先级D．上述说法都

[单选题]命令“spanning£­tree vlan”的功能是______。A.Catalyst 3500系统下启用STPB.Catalyst 6500系命令“spanning-tree vlan＜vlan＞”的功能是______。A．Catalyst 3500系统下启用STPB．Catalyst 6500系统下启用STPC．Catalyst 3500系统下配置生成树优先级D．上述说法都不对

[单选题]Which of the following is NOT tree?A．) Educational campaigns are very important to early sowing.B．) Of all the advances that the writer hopes for, early sowing is the most important.C．) Peasants should remain the masters of their fields.D．) Governmen

[单选题]命令“spanning-tree vlan<vlan>”的功能是( )。A．) Catalyst 3500系统下配置生成树优先级B．) Catalyst 6500系统下启用STPC．) Catalyst 3500系统下启用STPD．)上述说法都不对

[单选题]Which traversal method for a binary tree does the following Pascal code illustrate? procedure traverse (p:pointer); begin if p<>nil then begin traverse(p ↑ .left); process(p); traverse(p ↑ .right); end end;A．preorderB．postorderC．reorderD．inorde

[单选题]Which traversal method for a binary tree does the following Pascal code illustrate? Procedure traverse(p：pointer)； Begin Ifp<>NIL Then begin Traverse (p^．left)； Process(p)； Traverse(p^．right) End； End_A．pre_orderB．middle_orderC．noneD．last_order

[试题]A． bullet______(hit)the tree behind which he was hiding.

[单选题]当端口配置了spanning tree portfast后，从阻断状态到转发状态需要多长的时间？（）。A . 0秒B . 10秒C . 15秒D . 30秒

[单选题]思科Spanning-tree中，交换机的交换端口默认priority是多少（）。A . 32768B . 23571C . 128D . 1E . 256