CCNA(200-301)题库及答案
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Exam A
QUESTION 1
A network engineer must create a diagram of a multivendor network.which command must be configured on the Cisco devices so that the topology of the network can be mapped?
A.Device(config)#lldp run
B.Device(config)#cdp run
C.Device(config)# cdp enable
D.Device(config)# flow-sampler-map topology
Correct Answer: A
Section: (none)
Explanation
Explanation/Reference:
QUESTION 2
Which feature on the Cisco Wireless LAN Controller when enabled restricts management access from specific networks?
A.CPU ACL
B.TACACS
C.Flex ACL
D.RADIUS
Correct Answer: A
Section: (none)
Explanation
Explanation/Reference:
Reference:
https:///c/en/us/support/docs/wireless-mobility/wlan-security/71978-acl-wlc.html
QUESTION 3
When a site-to-site VPN is used, which protocol is responsible for the transport of user data?
A.IKEv2
B.IKEv1
C.IPsec
D.MD5
Correct Answer: C
Section: (none)
Explanation
Explanation/Reference:
QUESTION 4
How do TCP and UDP differ in the way that they establish a connection between two endpoints?
A.TCP use the three-way handshake,and UDP dose no guarantee message delivery
B.TCP use synchronization packets,and UDP uses acknowledgement packets
C.UDP provides reliable message transfer,and TCP is a connectionless protocol.
D.UDP use SYN,SYN ACK,and FIN bits in the frame header while TCP uses SYN,SYN ACK,and ACK bis.
Correct Answer: A
Section: (none)
Explanation
Explanation/Reference:
QUESTION 5
What are two reasons that cause late collisions to increment on an Ethernet interface?(choose two)
A.when the sending device waits 15 seconds before sending the frame again
B.when the cable length limits are exceeded
C.when one side of the connection is configured for half-duplex
D.when Carner Sense Multiple Access/Collision Detection is used
E.when a collision occurs after the 32nd byte of a frame has been transmitted
Correct Answer: BD
Section: (none)
Explanation
Explanation/Reference:
QUESTION 6
A Cisco IP phone receive untagged data traffic from an attached PC. Which action is taken by the phone?
A.It allows the traffic to pass through unchanged
B.It drops the traffic
C.It tags the traffic with the default VLAN
D.It tags the traffic with the native VLAN
Correct Answer: A
Section: (none)
Explanation
Explanation/Reference:
QUESTION 7