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Computer Networks → Introduction to Computer Networks 24

5G NSSAI is for
Network slice selection
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NEF in 5G provides
Secure API exposure of 5G capabilities to external apps
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NWDAF uses data for
ML-based network optimization and analytics
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5G MEC places computing at
Network edge near base stations for low latency
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C-RAN stands for
Centralized or Cloud Radio Access Network
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D2D communication in 5G allows
Direct device-to-device without going through base station
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V2X stands for
Vehicle-to-Everything communication
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Network densification in 5G means
Deploying many small cells for capacity
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Small cell in 5G is
Low-power short-range base station for dense deployment
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Massive MIMO uses
64 or more antennas at base station
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Network slicing NSSMF stands for
Network Slice Subnet Management Function
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5G fronthaul connects
Remote Radio Head to Baseband Unit
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O-RAN interface between RU and DU is called
Open Fronthaul (FH)
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SON in LTE/5G automates
Network configuration optimization and healing
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ANR in SON stands for
Automatic Neighbor Relation
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REST is
Representational State Transfer
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SOAP is
Simple Object Access Protocol
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JSON vs XML difference is
JSON is lighter and easier to parse
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gRPC is faster than REST because
Binary protocol buffers and HTTP/2 multiplexing
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AMQP is used for
Enterprise message queuing and routing
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MQTT QoS level 0 is
At most once (fire and forget)
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MQTT QoS level 1 is
At least once delivery
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MQTT QoS level 2 is
Exactly once delivery
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CoAP confirmable message requires
ACK from receiver
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Computer Networks → Transport Layer 10

TCP ACK segment consumes how many sequence numbers
0
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TCP SYN segment consumes how many sequence numbers
1
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TCP FIN segment consumes how many sequence numbers
1
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TCP ISN is
Randomly generated for security
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TCP piggybacking means
Combining ACK with data going in opposite direction
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TCP silly window syndrome is solved by
Clark solution waiting for adequate space before advertising window
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TCP Nagle algorithm TCP_NODELAY disables for
Low-latency applications needing immediate small packet send
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TCP PAWS stands for
Protection Against Wrapped Sequence numbers
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TCP keepalive interval default is
2 hours (varies by OS)
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TCP Reno vs Tahoe difference is on triple duplicate ACK Reno sets cwnd to
ssthresh not 1
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Computer Networks → HTTP and HTTPS 6

HTTP status 200 means
OK Success
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HTTP status 204 means
No Content (success but no body)
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HTTP status 201 means
Created (resource successfully created)
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HTTP status 302 means
Found (temporary redirect)
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HTTP status 429 means
Too Many Requests (rate limited)
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HTTP status 503 means
Service Unavailable
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