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QUESTION: 596

What is the function of FTP?

Always operated without user connection validation
Uses block number to identify and mitigate data-transfer errors
Relies on the well-known UDO port 69 for data transfer
Uses two separate connections for control and data traffic

Answer(s): D

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QUESTION: 597

How does TFTP operate in a network?

Provides secure data transfer
Relies on the well-known TCP port 20 to transmit data
Uses block numbers to identify and mitigate data-transfer errors
Requires two separate connections for control and data traffic

Answer(s): C

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QUESTION: 598

Refer to the exhibit. Which plan must be implemented to ensure optimal QoS marking practices on this network?

Trust the IP phone markings on SW1 and mark traffic entering SW2 at SW2
As traffic traverses MLS1 remark the traffic, but trust all markings at the access layer
Remark traffic as it traverses R1 and trust all markings at the access layer.
As traffic enters from the access layer on SW1 and SW2, trust all traffic markings.

Answer(s): A

Explanation:

Tell the switch to trust CoS markings from a Cisco IP phone on the access port. Cisco IP phones use 802.1q tags, these .1q tags contain the CoS value, to mark voice traffic at layer 2. When it's forwarded upstream, the DSCP value is trusted (on the uplink port) and unchanged, but the .1q tag (and with it the CoS value) is stripped off by the upstream switch when received over the trunk.

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