VOIP is being implemented in the Company network and you need to assess the need for
QoS. Which of the following network problems would indicate a need to implement QoS
features? (Select three)
A.
Mis-routed packets
B.
Excess jitter
C.
Delay of critical traffic
D.
Packet loss due to congestion
E.
Data link layer broadcast storms
F.
FTP connections unsuccessful
Explanation:
Loss, jitter, and delay are the three reasons for implementing QoS features on modern
networks. Loss is when a packet disappears on a network. Jitter is a timing mismatch
between two way traffic, and delay is when a packet takes too long to get somewhere.
Incorrect Answers:
A: This would indicate a routing problem, or packets being “black-holed.” QoS would not
help in this situation.
E: Broadcast storms indicate a problem on a LAN segment, such as a babbling host, too
many hosts, a segment that is too large, a bad application, etc. QoS would not help in this
situation.
F)
If only FTP sessions were having issues, then the FTP application or FTP server should
be corrected. Normally, FTP sessions are not delay sensitive due to the re-transmission
nature of TCP and do not require QoS.