多项选择题At which layers of the OSI model do WANs operate? (Choose two.)()

A.application layer
B.session layer
C.transport layer
D.network layer
E.datalink layer
F.physical layer


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1.多项选择题Which three statements describe the differences between RIP version 1 and RIP version 2? (Choose three.)()

A.RIP version 1 broadcasts updates whereas RIP version 2 uses multicasts.
B.RIP version 1 multicasts updates while RIP version 2 uses broadcasts.
C.Both RIP version 1 and RIP version 2 are classless routing protocols.
D.RIP Version 2 is a classless routing protocol whereas RIP version 1 is a classful routing protocol.
E.Both RIP version 1 and version 2 support authentication.
F.RIP version 2 sends the subnet mask in updates and RIP version 1 does not.

2.单项选择题When a new trunk is configured on a 2950 switch, which VLANs by default are allowed over the trunk link?()

A.no VLANs
B.all VLANs
C.only VLANs 1 - 64
D.only the VLANs that are specified when creating the trunk

3.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.

4.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.

5.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

6.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

7.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

9.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

10.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