單項選擇題Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?（）

A.Frame Relay
B.HDLC
C.x.25
D.PPP


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1.多項選擇題Which two options are valid WAN connectivity methods?（）

A.PPP
B.WAP
C.DSL
D.Ethernet
E.L2TPv3

2.單項選擇題At which layer of the OSI model dose PPP perform?（）

A.Layer 3
B.Layer 4
C.Layer 2
D.Layer 5

4.單項選擇題which command is used to enable CHAP authentication whit PAP as the fallback method on a serial interface?（）

A.(config-if)#authentication ppp chap fallback ppp
B.(config-if)#authentication ppp chap pap
C.(config-if)#ppp authentication chap pap
D.(config-if)#ppp authentication chap fallback ppp

6.單項選擇題Which statement is correct regarding the operation of DHCP?（）

A.A DHCP client uses a ping to detect address conflicts.(ARP)
B.A DHCP server uses a gratuitous ARP to detect DHCP clients.
C.A DHCP client uses a gratuitous ARP to detect a DHCP server.
D.If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.
E.If an address conflict is detected, the address removed from the pool for an amount of time configurable by the administrator.
F.If an address conflict is detected, the address is removed from the pool and will not be reused until server is rebooted.

7.單項選擇題

Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem?（）

A.data link layer
B.application layer
C.access layer
D.session layer
E.network layer

8.多項選擇題Refer to the exhibit. The two connected ports on the switch are not turning orange or green. What would be the most effective steps to troubleshoot this physical layer problem?（）

A.Ensure that the Ethernet encapsulations match on the interconnected router and switch ports.
B.Ensure that cables A and B are straight-through cables.
C.Ensure cable A is plugged into a trunk port.
D.Ensure the switch has power.
E.Reboot all of the devices.
F.Reseat all cables.

9.單項選擇題Which port state is introduced by Rapid-PVST?（）

A.learning
B.listening
C.discarding
D.forwarding

10.單項選擇題Refer to the exhibit.HostA cannot ping HostB.Assuming routing is properly configured,what could be the cause of this problem?（）

A.HostA is not on the same subnet as its default gateway
B.The address of SwitchA is a subnet address
C.The Fa0/0 interface on RouterA is on a subnet that cannot be used
D.The serial interfaces of the routers are not on the same subnet
E.The Fa0/0 interface on RouterB is using a broadcast address