單項選擇題Which spread spectrum technology does the 802.11b standard define for operation（）。

A.IR
B.DSSS
C.FHSS
D.DSSS and FHSS
E.IR, FHSS, and DSSS


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1.單項選擇題What is the function of the command switchport trunk native vlan 999 on a？（）

A.It designates VLAN 999 for untagged traffic.
B.It blocks VLAN 999 traffic from passing on the trunk.
C.It creates a VLAN 999 interface.
D.It designates VLAN 999 as the default for all unkown tagged traffic.

2.單項選擇題

Refer to the exhibit. What can be determined about the router from the console output?（）

A.No configuration file was found in NVRAM.
B.No configuration file was found in flash.
C.No configuration file was found in the PCMCIA card.
D.Configuration file is normal and will load in 15 seconds.

3.單項選擇題What is the most efficient summarization that R1 can use to advertise its networks to R2（）。

A.172.1.0.0/22
B.172.1.0.0/21
C.172.1.4.0/22
D.172.1.4.0/24 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24
E.172.1.4.0/25 172.1.4.128/25 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24

4.多項選擇題Which two statements describe the Cisco implementation of VLANs? （）

A.VLAN 1 is the default Ethernet VLAN.
B.CDP advertisements are only sent on VLAN 1002.
C.By default, the management VLAN is VLAN 1005.
D.By default, the switch IP address is in VLAN 1005.
E.VLAN 1002 through 1005 are automatically created and cannot be deleted.

5.單項選擇題

The user of Host1 wants to ping the DSL modem/router at 192.168.1.254. Based on the Host1 ARP table that is shown in the exhibit, what will Host1 do（）。

A.send a unicast ARP packet to the DSL modem/router
B.send unicast ICMP packets to the DSL modem/router
C.send Layer 3 broadcast packets to which the DSL modem/router responds
D.send a Layer 2 broadcast that is received by Host2, the switch, and the DSL modem/router