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Computer Networks → Introduction to Computer Networks 33

G.711 is
PCM voice codec 64 Kbps for PSTN and VoIP
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G.729 codec provides
Low-bitrate speech at 8 Kbps for bandwidth-constrained links
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MOS for VoIP quality is scored from
1 to 5
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Acceptable MOS score for VoIP is
3.6+
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Jitter buffer in VoIP
Smooths out jitter by buffering packets before playback
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PSTN stands for
Public Switched Telephone Network
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SIP INVITE initiates
A multimedia session or call
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SIP 200 OK response means
Request succeeded - call accepted
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SIP BYE terminates
Established SIP session
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VoLTE stands for
Voice over LTE
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IMS stands for
IP Multimedia Subsystem
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CAP theorem stands for
Consistency Availability Partition tolerance
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Raft algorithm is for
Distributed consensus via leader election
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Blockchain networking uses
P2P network maintaining distributed ledger with consensus
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SFP+ supports data rate up to
10 Gbps
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Cat6A supports 10 Gbps up to
100 m
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Single-mode fiber uses core of approximately
8-10 um
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EDFA amplifies signals using
Erbium-doped fiber
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DWDM multiplies fiber capacity by
Carrying many wavelengths on one fiber
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OC-3 SONET data rate is
155 Mbps
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T1 line data rate is
1.544 Mbps
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E1 line data rate is
2.048 Mbps
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DS3/T3 line data rate is
44.736 Mbps
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DSL stands for
Digital Subscriber Line
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ADSL stands for
Asymmetric DSL
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DOCSIS is used for
Cable internet service over coaxial
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PON stands for
Passive Optical Network
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FTTH stands for
Fiber To The Home
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GEO satellite altitude is
35786 km
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LEO satellite altitude is approximately
500-1200 km
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Starlink uses which orbit
LEO megaconstellation
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GPS satellites orbit at
20200 km
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GEO satellite round-trip latency is approximately
600 ms
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Computer Networks → Transport Layer 1

RTCP provides
QoS feedback and statistics for RTP streams
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Computer Networks → Routing Algorithms 1

OSPF uses which PDU for neighbor discovery
Hello packet
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Computer Networks → Data Link Layer 5

Ethernet preamble followed by SFD total bytes are
8
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Standard Ethernet was created at Xerox PARC in year
1973
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Fast Ethernet speed is
100 Mbps
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Gigabit Ethernet speed is
1 Gbps
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10 Gigabit Ethernet standard is
802.3ae
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