TCP GCIA Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   A network architect is designing a system that requires reliable, ordered delivery of messages between two servers, but also needs to support multiple simultaneous streams to avoid head-of-line blocking. Which transport protocol should be chosen?

   • ATCP
   • BSCTP
   • CUDP
   • DICMP
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   Which TCP option allows the receiver to acknowledge non-contiguous data, improving efficiency when segments are lost?

   • ASelective Acknowledgment (SACK)
   • BMaximum Segment Size
   • CTimestamps
   • DWindow scaling
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   What triggers TCP fast retransmit?

   • AReceiving a RST segment
   • BThe expiration of the retransmission timer
   • CReceiving three duplicate ACKs for the same sequence number
   • DThe sender's window size reaching zero
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A TCP sender receives three consecutive duplicate ACKs for sequence number 5000. According to standard TCP congestion control, what action should the sender take?

   • AWait for the retransmission timeout to expire before resending.
   • BIgnore the duplicate ACKs and continue transmitting new data.
   • CRetransmit the segment starting at sequence 5000 and enter fast recovery.
   • DReduce the congestion window to one segment and restart slow start.
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   What is the role of the retransmission timeout (RTO) in TCP?

   • AIt defines the initial sequence number for the connection.
   • BIt determines how long the sender waits for an ACK before retransmitting a segment.
   • CIt specifies the maximum segment lifetime in the network.
   • DIt controls the size of the receive window.
   Reveal Solution Discussion Select an answer first