Network Basic

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Grasp the network flow

[Schematic] How does a Proxy server work? – http GET / https CONNECT method), DNS name order, Role, Advantage –

Aproxyserver aproxyresponseserverthatisu...
IP

About tracert (traceroute)

tracert(traceroute)isatooltoverifytheIPa...
Routing

About VRF (Virtual Routing and Forwarding)

AboutVRFVRFstandsforVirtualRoutingandFow...
Routing

Policy-Based-Routing and IPROUTE2

PBR(Policy-BasedRouting)Iwrotebeforewhen...
Link Aggregation

How to determine Active port / Standby port by LACP

InLACP,upto16EthernetcanbeincludedinoneL...
Link Aggregation

LACP format and structure

FormatofLACPTheformatofLACPisasfollows.A...
Link Aggregation

What is Slow Protocol

WhenlinkaggregationandLACParestandardize...
Must Know As a Network Engineer

OSI Reference Model and IP Set Model

WhatisOSIReferenceModelandIPSetModelAllN...
Firewall

How Stateful Inspection Works

WhatisStatefulInspectionStatefulInspecti...
TCP/UDP

Format of UDP

Asmentionedbefore,UDPislightinloadbuthas...
TCP/UDP

Reliability of TCP

TCPreliabilityisimplementedwithsequencen...
TCP/UDP

TCP state transition

TCPhasanattributecalled"State"thatshowsw...
TCP/UDP

TCP connection

TheTCPconnectionstartswith3wayhandshake....
TCP/UDP

TCP Options

TCPoptionsisrepresentedasfollowingformat...
TCP/UDP

TCP segment format

ThecommunicationdataunitofTCPisoftenrefe...
TCP/UDP

TCP / UDP Overview

TCP/UDPprovidesacommunicationchannelbetw...
IP

What is ICMP ~ Difference from layer and TCP, about how to use ~

WhatisICMPICMP standsforInternetControlM...
IP

What is IP address

IPaddressistheaddressonnetworkcommunicat...
Routing

Broadcast routing

TherearetwotypesofIPbroadcast.OneisLimit...
Routing

Cause and avoidance design of routing loop

TheroutingloopissaidthestatethatIPpacket...
Routing

Rule of routing #5 Recursive Routing

NextHopaddressoftheroutingisbasicallytos...
Routing

Rule of routing #4 Administrative Distance (AD)

AboutAdministrativeDistance(AD)Administr...
Routing

Rule of routing #3 Longest Match

Considerthenetworksuchasthefollowing.Ont...
Routing

Rule of routing #2 Packet Discarding

(InLayer3,)thecasesthatincommingpacketis...
Routing

Rule of routing #1 Header rewriting

TherewasnoparticularchangeintheEtherneth...
Routing

Routing table

InthememoryoftheNWdevicesofLayer3(router...
Routing

Configuring Routing

AlthoughswitchingcanlearntheMACaddressta...
Routing

Routing Overview

TheLayer2definescommunicationdirectlyorb...
Switching

Difference between MAC address table and ARP table

ThedifferencebetweentheMACaddresstablean...
Grasp the network flow

Differrence between MTU & MSS, IP Fragmentation & TCP Segmentation

DifferencebetweenMTU&MSSMTU(MaximumTrans...