Quick Revision

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 → Network Layer 2

IPv6 solicited-node multicast is based on
Last 24 bits of IPv6 address
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IPv6 Teredo tunneling helps with
IPv6 over IPv4 NAT for Windows clients
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Computer Networks → Application Layer 1

DHCPv6 stateless mode provides
Other config like DNS without IP address (SLAAC provides IP)
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Computer Networks → Routing Algorithms 2

OSPFv3 difference from OSPFv2 is
Runs natively over IPv6 and supports multiple address families
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OSPF metric is based on
Reference bandwidth / interface bandwidth
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Computer Networks → Introduction to Computer Networks 32

IS-IS was originally designed for
OSI network layer CLNS
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RIP metric is
Hop count
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EIGRP metric uses
Bandwidth delay load reliability (composite)
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BGP selects best path by
Multiple attributes in order (weight LP AS-path origin MED)
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Administrative distance of connected route is
0
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Administrative distance of static route is
1
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Administrative distance of EIGRP is
90
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Administrative distance of iBGP is
200
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Policy-based routing can route based on
Source IP ToS application or other criteria
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ECMP load balances across
Multiple equal-cost paths simultaneously
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CEF uses FIB for
Hardware-based packet forwarding decisions
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Adjacency table in CEF contains
Layer 2 encapsulation info for next-hop forwarding
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ASIC in switches enables
Wire-speed packet forwarding
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TCAM enables
Fast ternary pattern matching for ACLs and routing
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Control plane handles
Routing protocol processing and routing table management
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Data plane handles
Actual packet forwarding using FIB
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Management plane provides
Out-of-band access via SSH SNMP Telnet
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NPU is positioned between
ASIC and CPU for programmable packet processing
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SR-MPLS uses which control plane
Segment routing control with MPLS data plane
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SRv6 uses which data plane
IPv6 extension header SRH with segment list
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MEF stands for
Metro Ethernet Forum
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MPLS-TE benefit is
Traffic engineering with explicit path and bandwidth control
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P-router in MPLS is
Provider core router performing label switching
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PE-router in MPLS is
Provider Edge router connecting customer to MPLS
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CE-router in MPLS VPN is
Customer Edge router connecting to PE
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GRE tunnel encapsulates
Any network layer packet
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IPSec tunnel mode encrypts
The entire original IP packet
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OpenDaylight is
Open source SDN controller platform
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ONOS is
Open Network Operating System for SDN
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P4 language is used to
Program data plane behavior of network devices
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eBPF enables
In-kernel programmable packet processing for networking
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XDP provides
High-performance packet processing at driver level
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Computer Networks → Data Link Layer 3

E-Line in carrier Ethernet is
Point-to-point Ethernet Virtual Connection
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E-LAN in carrier Ethernet is
Multipoint-to-multipoint EVC
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E-Tree in carrier Ethernet is
Rooted multipoint EVC with hub-and-spoke like structure
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