單項選擇題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.單項選擇題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.多項選擇題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.單項選擇題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.多項選擇題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