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GK One-Line Question & Answer

15541+ short questions with short answers, covering every category and sub-category on the site — no long articles to scroll through. Good for a fast recap before an exam, or a few minutes of daily practice.

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Computer Networks → Introduction to Computer Networks 30

What is MPLS entropy label purpose
Better load balancing in ECMP across parallel LSPs
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What is SRv6 H.Insert operation
Inserting SRH extension header into packet
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What is SRv6 T.Insert operation
Inserting SRH with reduced header form
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What is SRv6 END function
Basic endpoint function decrementing SL and forwarding
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What is SRv6 END.X function
Endpoint with cross-connect to specific adjacency
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What is SRv6 END.DT4 function
Endpoint decapsulation for IPv4 lookup in specific table
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What is SRv6 END.DT6 function
Endpoint decapsulation for IPv6 lookup in specific table
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What is BIER-TE
Bit Index Explicit Replication with Traffic Engineering
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What is BIER domain
Set of BIER-capable routers sharing forwarding bit strings
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What is BIER BFR
Bit Forwarding Router in BIER domain
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What is BIER BFER
Bit Forwarding Egress Router (multicast receiver side)
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What is AAAA record lookup process
DNS resolver queries for AAAA type returning IPv6 address
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What is DNS64 used with NAT64
Synthesizing AAAA records for IPv4-only servers
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What is NAT44
IPv4-to-IPv4 NAT (traditional NAT)
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What is CGNAT
Carrier-grade NAT at ISP level for large-scale IPv4 sharing
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What is MAP-T
Mapping of Address and Port using Translation (IPv6 transition)
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What is MAP-E
Mapping of Address and Port using Encapsulation (IPv6 transition)
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What is 464XLAT architecture
Combining CLAT on device and PLAT (NAT64) in network
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What is CLAT in 464XLAT
Customer-side translator converting IPv4 to IPv6
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What is PLAT in 464XLAT
Provider-side translator converting IPv6 back to IPv4 (NAT64)
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What is DS-Lite
Dual-Stack Lite tunneling IPv4 in IPv6 to reach IPv4 internet
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What is B4 in DS-Lite
Basic Bridging BroadBand element (home gateway) in DS-Lite
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What is AFTR in DS-Lite
Address Family Transition Router at ISP for DS-Lite
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What is Lightweight 4over6
Per-subscriber IPv4-in-IPv6 tunnel for full IPv4 preservation
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What is GRE keepalive
Detecting GRE tunnel endpoint failure
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What is NHRP
Next Hop Resolution Protocol for DMVPN
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What is DMVPN
Dynamic Multipoint VPN using GRE mGRE and NHRP
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What is mGRE
Multipoint GRE tunnel interface
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What is DMVPN Phase 1
Hub-and-spoke with all spoke traffic through hub
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What is DMVPN Phase 2
Spoke-to-spoke tunnels after NHRP resolution
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Computer Networks → Network Layer 10

What is flow label in IPv6 used for
QoS and ECMP load balancing identification
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What is IPv6 jumbogram
IPv6 packet larger than 65535 bytes using hop-by-hop option
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What is IPv6 anycast address
Address assigned to multiple interfaces routing to nearest
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What is IPv6 multicast FF02::1
All nodes on local link (all-nodes)
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What is IPv6 multicast FF02::2
All routers on local link (all-routers)
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What is IPv6 multicast FF02::5
All OSPF routers on local link
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What is IPv6 multicast FF02::6
All OSPF DR routers on local link
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What is IPv6 multicast FF02::9
All RIP routers on local link
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What is IPv6 multicast FF02::A
All EIGRP routers on local link
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What is IPv6 multicast FF02::D
All PIM routers on local link
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