單項選擇題The classic Spanning Tree Protocol (802.1 D 1998) uses which sequence of variables to determine thebest received BPDU?()

A.1) lowest root bridge id,2) lowest sender bridge id,3) lowest port id,4) lowest root path cost
B.1) lowest root path cost,2) lowest root bridge id,3) lowest sender bridge id,4) lowest sender port id
C.1) lowest root bridge id,2) lowest sender bridge id,3) lowest root path cost,4) lowest sender port id
D.1) lowest root bridge id,2) lowest root path cost,3) lowest sender bridge id,4) lowest sender port id


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1.單項選擇題Which of these best describes the actions taken when a VTP message is received on a switch configuredwith the VTP mode "transparent"?()

A.VTP updates are ignored and forwarded out all ports.
B.VTP updates are ignored and forwarded out trunks only.
C.VTP updates are made to the VLAN database and are forwarded out trunks only.
D.VTP updates are ignored and are not forwarded.

3.多項選擇題Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree ProtocolIEEE 802.1 D?()

A.Designated Root Cost
B.bridge ID priority
C.max age
D.bridge ID MAC address
E.Designated Root Priority
F.forward delay

4.單項選擇題Spanning Tree Protocol IEEE 802.1 s defines the ability to deploy which of these?()

A.one global STP instance for all VLANs
B.one STP instance for each VLAN
C.one STP instance per set of VLANs
D.one STP instance per set of bridges

5.單項選擇題Two routers configured to run BGP have been connected to a firewall, one on the inside interface and one on the outside interface. BGP has been configured so the two routers should peer, including the correctBGP session endpoint addresses and the correct BGP session hop-count limit EBGP multihop. What is agood first test to see if BGP will work across the firewall?()

A.Attempt to TELNET from the router connected to the inside of the firewall to the router connected to theoutside of the firewall. If telnet works, BGP will work, since telnet and BGP both use TCP to transportdata.
B.Ping from the router connected to the inside interface of the firewall to the router connected to theoutside interface of the firewall. If you can ping between them, BGP should work, since BGP uses IP totransport packets.
C.There is no way to make BGP work across a firewall without special configuration, so there is no simpletest that will show you if BGP will work or not, other than trying to start the peering session.
D.There is no way to make BGP work across a firewall.

7.單項選擇題What is also called Type 0 authentication in OSPF on Cisco Routers?()

A.MD5
B.There is no Type 0 authentication
C.SHA1
D.Null

9.單項選擇題Which of the following is true about the MPLS header and its EXP field size?()

A.The MPLS header is 2 bytes,and the EXP field is 3 bits long.
B.The MPLS header is 1 byte,and the EXP field is 3 bits long.
C.The MPLS header is 4 bytes,and the EXP field is 3 bits long.
D.The MPLS header is 3 bytes,and the EXP field is 3 bits long.

10.多項選擇題Which two statements are true about RED?()

A.RED randomly drops packets before the queue becomes full.
B.RED is always useful,without dependency on flow.
C.RED increases the drop rate as the average queue size increases.
D.RED has a per-flow intelligence.

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