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 → Transport Layer 3

TCP Tahoe on triple duplicate ACK drops cwnd to
1 MSS
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TCP Reno on triple duplicate ACK sets cwnd to
ssthresh (half previous cwnd)
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TCP delayed ACK waits up to
500 ms
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Computer Networks → Introduction to Computer Networks 28

ssthresh is initialized to
Maximum window size
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Path MTU Discovery sets which bit in IP header
DF
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NTP stands for
Network Time Protocol
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SIP stands for
Session Initiation Protocol
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AWS VPC stands for
Virtual Private Cloud
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AWS security group is
Stateful virtual firewall for EC2 instances
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AWS NACL is
Stateless subnet-level packet filter
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AWS Direct Connect provides
Dedicated private connection to AWS bypassing internet
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Azure ExpressRoute provides
Dedicated private connection from on-premises to Azure
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SASE stands for
Secure Access Service Edge
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Zero Trust principle is
Never trust always verify regardless of location
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CASB stands for
Cloud Access Security Broker
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CDN stands for
Content Delivery Network
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RADIUS stands for
Remote Authentication Dial-In User Service
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TACACS+ is used primarily for
Network device administration
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802.1X is used for
Port-based network access control
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EAP stands for
Extensible Authentication Protocol
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LDAP is used for
Directory services for user information
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Kerberos uses
Tickets for mutual authentication
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AAA stands for
Authentication Authorization Accounting
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CDP stands for
Cisco Discovery Protocol
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LLDP stands for
Link Layer Discovery Protocol
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NETCONF transport is
SSH (TCP port 830)
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Leaf-spine architecture is
2-tier fat-tree for low latency data center
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ECMP stands for
Equal Cost Multi-Path routing
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SR-IOV allows physical NIC to appear as
Multiple virtual NICs for VMs
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RDMA stands for
Remote Direct Memory Access
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DPDK is used for
High-performance packet processing bypassing kernel
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Computer Networks → Application Layer 5

SNMP stands for
Simple Network Management Protocol
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SNMP uses transport
UDP
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SNMP MIB stands for
Management Information Base
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SNMP trap is
Unsolicited alert from agent to manager
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SNMP v3 adds over v1/v2
Security authentication and encryption
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Computer Networks → FTP and SMTP 3

TFTP uses which transport
UDP
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POP3 stands for
Post Office Protocol version 3
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IMAP allows user to
Manage emails directly on server
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Computer Networks → Types of Networks 1

SD-WAN stands for
Software-Defined WAN
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