PrepAway Cisco CCNA Certification Practice Test Questions Part 8 200-125 Exam

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PrepAway Cisco CCNA Certification Practice Test Questions Part 8 200-125 Exam

Which field is included in an IP packet that is used for QoS and is 8 bits long.

  • A. TOS
  • B. COS
  • C. IPP
  • D. DSCP
Answer:  A 

Explanation:

TOS field refers to the Type of Service Field in an IP Packet. It is an 8 byte field that we typically use for differentiated services code points (DSCP) today. This was originally referred to as TOS but now it is referred as DSCP now. So the idea is that we can mark packets using these 8 bytes to some format and that could represent an expedited forwarding.

For example, we have a voice packet and this voice packet need to be moved quickly else we will have to deal with latency and distorted voice quality. If that’s the case then we can mark it as EF and then send it through the network. The problem here is that there is no guarantee that the request is going to be honoured throughout the network. QoS is also the same thing.

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