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Share some CCNA Routing and Switching 200-125 exam questions and answers below.
What feature uses a random time to re-sent a frame?
A. CSMA/CA
B. CSMA/CD
Answer: B

Which two statements about wireless LAN controllers are true? (Choose two.)
A. They can simplify the management and deployment of wireless LANs.
B. They rely on external firewalls for WLAN security.
C. They are best suited to smaller wireless networks.
D. They must be configured through a GUI over HTTP or HTTPS.
E. They can manage mobility policies at a systemwide level.
Answer: AE

Which command can you enter to determine whether serial interface 0/2/0 has been configured using HDLC encapsulation?
A. router#show platform
B. router#show interfaces Serial 0/2/0
C. router#show ip interface s0/2/0
D. router#show ip interface brief
Answer: B

Which command can you enter to configure an IPV6 floating static route?
A. Router(config)# ipv6 route FE80:0202::/32 serail 0/1 201
B. Router(config)# ipv6 route::/0 serail0/1
C. Router(config)# ipv6 route static resolve default
D. Router(config)# ipv6 route FE80:0202::/32 serail 0/1 1
Answer: A

Which interface counter can you use to diagnose a duplex mismatch problem?
A. no earner B. late collisions
C. giants
D. CRC errors
E. deferred
F. runts
Answer: B

What is the authoritative source for an address lookup?
A. a recursive DNS search
B. the operating system cache
C. the ISP local cache
D. the browser cache
Answer: A

Which two statements about IPv6 router advertisement messages are true? (Choose two.)
A. They use ICMPv6 type 134.
B. The advertised prefix length must be 64 bits.
C. The advertised prefix length must be 48 bits.
D. They are sourced from the configured IPv6 interface address.
E. Their destination is always the link-local address of the neighboring node.
Answer: AB

Which command can you execute to set the user inactivity timer to 10 seconds?
A. SW1(config-line)#exec-timeout 0 10
B. SW1(config-line)#exec-timeout 10
C. SW1(config-line)#absolute-timeout 0 10
D. SW1(config-line)#absolute-timeout 10
Answer: A

What are three benefits of implementing vlans?(choose three)
A. A more efficient use of bandwidth can be achieved allowing many physical groups to use the same network infrastructure
B. Broadcast storms can be mitigated by decreasing the number of broadcast domains, thus increasing their size.
C. A higher level of network security can be reached by separating sensitive data traffic from other network traffic.
D. Port-based vlans increase switch-port use efficient, thanks to 802.1Q trunks
E. A more efficient use of bandwidth can be achieved allowing many logical networks to use the same network infrastructure.
F. Broadcast storms can be mitigated by increasing the number of broadcast domains,thus reducing their size.
G. VLANs make it easier for IT staff to configure new logical groups,because the vlans all belong to the same broadcast domain.
Answer: CEF

What is true about DTP? (Choose Three.)
A. Layer 2 protocol
B. Layer 3 protocol
C. Proprietary protocol
D. enabled by default
E. disabled by default
Answer: ACD

A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame is then discarded. At which OSI layer did this happen?
A. session
B. transport
C. network
D. data link
E. physical
Answer: D

When an interface is configured with PortFast BPDU guard, how does the interface respond when it receives a BPDU?
A. It continues operating normally.
B. It goes into a down/down state.
C. It becomes the root bridge for the configured VLAN.
D. It goes into an errdisable state.
Answer: D

What 8-bit field exists in IP packet for QoS?
A. Tos Field
B. DSCP
C. IP Precedence
D. Cos
Answer: A

Two hosts are attached to a switch with the default configuration.
Which statement about the configuration is true?
A. IP routing must be enabled to allow the two hosts to communicate.
B. The two hosts are in the same broadcast domain.
C. The switch must be configured with a VLAN to allow the two hosts to communicate.
D. Port security prevents the hosts from connecting to the switch.
Answer: B

A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port?
A. This is a 10 Mb/s switch port.
B. This is a 100 Mb/s switch port.
C. This is an Ethernet port operating at half duplex.
D. This is an Ethernet port operating at full duplex.
E. This is a port on a network interface card in a PC.
Answer: C

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