单项选择题What is the function of the command switchport trunk native vlan 999 on a Cisco Catalyst switch?()

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


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1.单项选择题A Cisco router is booting and has just completed the POST process. It is now ready to find and load an IOS  image. What function does the router perform next?()

A.It checks the configuration register.
B.It attempts to boot from a TFTP server.
C.It loads the first image file in flash memory.
D.It inspects the configuration file in NVRAM for boot instructions.

2.多项选择题What functions do routers perform in a network? (Choose two.)()

A.packet switching
B.access layer security
C.path selection
D.VLAN membership assignment
E.bridging between LAN segments
F.microsegmentation of broadcast domains

3.单项选择题At which OSI layer is a logical path created between two host systems?()

A.session
B.transport
C.network
D.data link
E.physical

4.多项选择题What three pieces of information can be used in an extended access list to filter traffic? (Choose three.)()

A.protocol
B.VLAN number
C.TCP or UDP port numbers
D.source switch port number
E.source IP address and destination IP address
F.source MAC address and destination MAC address

6.单项选择题During startup, the router displays the following error message: boot: cannot open "flash:" What will the router do next?()

A.Because of damaged flash memory, the router will fail the POST
B.It will attempt to locate the IOS from a TFTP server. If this fails, it will initiate the setup dialog.
C.It will attempt to locate the IOS from a TFTP server. If this fails, it will load a limited IOS from ROM
D.It will attempt to locate the configuration file from a TFTP server. If this fails, it will initiate the setup dialog.
E.It will attempt to locate the configuration file from a TFTP server. If this fails, it will load a limited configuration from ROM

7.单项选择题What does the "Inside Global" address represent in the configuration of NAT?()

A.the summarized address for all of the internal subnetted addresses
B.the MAC address of the router used by inside hosts to connect to the Internet
C.a globally unique, private IP address assigned to a host on the inside network
D.a registered address that represents an inside host to an outside network

8.单项选择题Which statement accurately describes a benefit provided by VTP?()

A.VTP allows routing between VLANs.
B.VTP allows a single port to carry information to more than one VLAN
C.VTP allows physically redundant links while preventing switching loops.
D.VTP allows switches to share VLAN configuration information.

9.单项选择题On which types of network will OSPF elect a backup designated router?()

A.point-to-point and multiaccess
B.point-to-multipoint and multiaccess
C.point-to-point and point-to-multipoint
D.nonbroadcast and broadcast multipoint
E.nonbroadcast and broadcast multiaccess

10.单项选择题Why would a network administrator configure port security on a switch?()

A.to prevent unauthorized Telnet access to a switch port
B.to limit the number of Layer 2 broadcasts on a particular switch port
C.to prevent unauthorized hosts from accessing the LAN
D.to protect the IP and MAC address of the switch and associated ports
E.to block unauthorized access to the switch management interfaces over common TCP ports

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