简答题 OSPF的域间路由通告行为？问R1能够将AREA 1通告给AREA 0的域间路由在通告回AREA 1吗？为什么？

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， anunauthorized switch 2 was found.This unauthorized switch has been a regular problem， assuming the root bridge function under thespanning-tree domain and causing the Engineering VLAN to be unstable. Which three of these actionscould 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.

多项选择题Refer to the exhibit. As a network administrator， you have configured a dual-rate， dual-bucket policer in accordance with RFC 2698 on the serial interface of you router， connecting to your provider. The SLA with your provider states that you should only send AF31 （limited to 150 kb s）， AF32 （limited to 50 kb s）and AF33 （best effort）. Your service provider claims you are not conforming to the SLA.Which two things are wrong with this configuration？ （）

A.The configuration of a service policy on half-duplex Ethernet interfaces is not supported.
B.The class class-default sub-command of the policy-map limit command should be set to the DSCP default.
C.The violate action is wrong.
D.This policer configuration is not implementing RFC 2698 dual-bucket， dual-rate.
E.The policer is configured in the wrong class.

问答题whatdevicesendsIGMPQuerymessages？

单项选择题Refer to exhibits 1 and 2. A company uses a Metro Ethernet （Gigabit Ethernet） dedicated circuit to communicate between users （subnet B） and servers （subnet A） as shown in Exhibit 1. Both routers use OSPF to advertise the subnets. During a weekly management meeting， they realize that the WAN link is oversize. They have been using only 2 Mb s in the worst-case scenario. So they propose a new， cheaper WAN connection using a 2-Mb s Frame-Relay point-to-point link to interconnect both sites （Exhibit 2）. The Frame Relay service provider informs them that multicast traffic is not allowed to run over the service provider network. Which one of these options is best to enable the company to establish the OSPF neighbor adjacency？（）

A.Use OSPF network broadcast，because it uses unicast to establish a neighbor relationship.
B.Use OSPF network point-to-multipoint，because it uses unicast to establish a neighbor relationship.
C.Use OSPF network point-to-point，because it uses unicast to establish a neighbor relationship.
D.Use OSPF network point-to-multipoint nonbroadcast，because it establishes a neighbor relationship using unicast packets.
E.Use OSPF network nonbroadcast，because it establishes a neighbor relationship using multicast.

问答题哪个设备会被选为根桥？