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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 35

What is iWARP vs RoCE
iWARP uses TCP/IP RoCE uses Ethernet layer directly
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What is NVMe over Fabrics (NVMe-oF)
Extending NVMe protocol over network fabrics for remote storage
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What is NVMe-oF transport options
RDMA (RoCE iWARP) FC or TCP
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What is SmartNIC
NIC with programmable processing offloading host CPU tasks
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What is DPU (Data Processing Unit)
Programmable network processor for infrastructure offload
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What is HW offload benefit
Moving network processing from CPU to dedicated hardware
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What is OVS-DPDK
Open vSwitch using DPDK for high-performance software switching
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What is VirtIO network driver
Paravirtualized network device driver for VMs
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What is VFIO in Linux
Framework for direct device assignment to VMs
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What is hardware acceleration in networking
Using FPGAs ASICs or SmartNICs to speed network processing
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What is network simulation vs emulation difference
Simulation models behavior emulation runs real OS code
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What is Packet Tracer limitations
Cannot run all real Cisco IOS features
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What is GNS3 advantage over Packet Tracer
Runs real OS images with full feature support
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What is EVE-NG advantage
Multi-vendor support with browser-based lab interface
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What is network documentation importance
Enables troubleshooting change management and compliance
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What is IP address management (IPAM)
Centralized management of IP address space
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What is DNS management in IPAM
Integrating DNS with IPAM for consistent management
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What is NetBox used for
Open source DCIM and IPAM tool
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What is DCIM
Data Center Infrastructure Management
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What is NetFlow version 9
Template-based NetFlow with extended field support
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What is IPFIX
IP Flow Information Export (standardized NetFlow)
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What is sFlow
Packet sampling protocol for network monitoring
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What is the difference between NetFlow and sFlow
NetFlow exports full flow records sFlow samples packets
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What is BGP looking glass
Public router showing BGP routing table from ISP perspective
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What is routeviews.org
Project collecting BGP routing table data from multiple vantage points
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What is RIPE RIS
Routing Information Service - BGP data collection by RIPE
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What is PeeringDB
Database of network peering information
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What is ARIN WHOIS
Database of IP address and AS number registration info
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What is BGP community 65535:666
BGP blackhole community for DDoS mitigation
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What is BGP no-export community (65535:65281)
Do not advertise to eBGP peers
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What is BGP no-advertise community
Do not advertise to any peer
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What is BGP local-AS community
Do not advertise outside local AS
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What is BGP graceful shutdown community
Signal planned maintenance for clean traffic migration
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What is internet routing registry (IRR)
Database of routing policy and prefix ownership info
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What is RPSL
Routing Policy Specification Language for IRR entries
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Computer Networks → Types of Networks 1

What is WAN emulator used for
Simulating WAN conditions (latency loss jitter) in lab
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Computer Networks → Application Layer 2

What is DHCP management in IPAM
Integrating DHCP scopes with IPAM
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What is SNMP walk
Querying entire SNMP MIB tree of a device
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Computer Networks → Network Topologies 2

What is network topology discovery
Automatically mapping network devices and connections
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What is CDP/LLDP used for in topology discovery
Discovering directly connected devices and their details
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