單項選擇題What is the function of the CSMA/CD algorithm in Ethernet technologies?（）

A. defines how the media is accessed
B. supplies a token to determine which host has access to the media
C. defines the encoding of electrical signals on the wire
D. determines the preamble bits


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1.單項選擇題What value is primarily used to determine which port becomes the root port on each non root switch in a spanning-tree topology?（）

A. path cost
B. lowest port MAC address
C. VTP revision number
D. highest port priority number
E. port priority number and MAC address

2.單項選擇題What is the purpose of the OSPF router ID in a OR/BOR election?（）

A. It is used with the OSPF priority values to determine which OSPF router will become the DR or BOR in a point-to-point network
B. It is used with the OSPF priority values to determine which interface will be used to form a neighbor relationship with another OSPF router
C. It is used with the OSPF priority values to determine which router will become the DR or BOR in a multi access network
D. It is used to determine which interfaces will send Hello packets to neighboring OSPF routers

3.單項選擇題A network administrator needs to verify that switch interface 0/5 has been assigned to the Sales VLA.N. Which command will accomplish this task?（）

A. Show vlan
B. Show mac-address-table
C. Show vtp status
D. show spanning-tree root
E. show ip interface brief

4.單項選擇題How can an administrator determine if a router has been configured when it is first powered up?（）

A. A configured router prompts for a password
B. A configured router goes to the privileged mode prompt
C. An un configured router goes into the setup dialog
D. An un configured router goes to the enable mode prompt


5.單項選擇題When is a switched network that is running the Spanning Tree Protocol considered to be fully converged?（）

A. when all switches have the same BID as the root switch
B. when all switches have received the MAC address of each neighboring switch
C. when every enabled switch port has been assigned a unique identifier
D. when every operating switch port is in either the blocking or forwarding state
E. when all switches are in either client, server, or transparent mode

6.單項選擇題At a branch location, TestKing.com has deployed a non modular router that is equipped with two serial interfaces and two Ethernet interfaces.What additional equipment must be used to allow the branch office to connect to the central office by using an ISDN service?（）

A. a serial cable with a V.35 to RJ45 adapter
B. a CSU/DSU
C. an external ISDN TA and NT1
D. The non-modular router cannot connect to an ISDN service. The network administrator must purchase a modular router with an ISDN BRI-U card.

7.單項選擇題At a branch location, TestKing.com has deployed a non modular router that is equipped with two serial interfaces and two Ethernet interfaces.What additional equipment must be used to allow the branch office to connect to the central office by using an ISDN service?（）

A. a serial cable with a V.35 to RJ45 adapter
B. a CSU/DSU
C. an external ISDN TA and NT1
D. The non-modular router cannot connect to an ISDN service. The network administrator must purchase a modular router with an ISDN BRI-U card.

8.多項選擇題What are two results of entering the Switch(config)# vtp mode client command on a Catalyst switch?（）

A. The switch will ignore VTP summary advertisements
B. The switch will forward VTP summary advertisements
C. The switch will process VTP summary advertisements
D. The switch will originate VTP summary advertisements
E. The switch will create, modify and delete VLANs for the entire VTP domain