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Network Protocols — Series 3
Preview — 3 of 10 questions
An internal client resolved a hostname yesterday and keeps an established connection open indefinitely. DNS now points to a new host. Why may requests still reach the old host?
ADNS changes do not reroute an existing connection.
BThe resolver must use the new address for every request on that connection.
CDNS TTL applies only to authoritative name servers.
DTCP reconnects automatically whenever DNS changes.
A load balancer is removing a backend that has long-lived requests. Which sequence minimizes avoidable interruption?
ARemove all backend replicas together to clear connection state.
BStop new assignments, drain active requests, then terminate.
CTerminate the backend before updating routing membership.
DKeep routing new requests until all old ones finish.
Small requests succeed across a tunnel, but large transfers repeatedly stall. Captures show large packets retransmitted and no usable packet-too-big feedback. What is the most likely diagnosis?
AA receiver advertising a zero TCP window because its buffer is full.
BAn application response timeout shorter than the normal transfer time.
CA path-MTU discovery black hole.
DAn upstream HTTP body-size limit returning a 413 response.
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