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 –

A proxy server a proxy response server t...
IP

About tracert (traceroute)

tracert (traceroute) is a tool to verify...
Routing

About VRF (Virtual Routing and Forwarding)

About VRF VRF stands for Virtual Routing...
Routing

Policy-Based-Routing and IPROUTE2

PBR (Policy-Based Routing) I wrote befor...
Link Aggregation

How to determine Active port / Standby port by LACP

In LACP, up to 16 Ethernet can be includ...
Link Aggregation

LACP format and structure

Format of LACP The format of LACP is as ...
Link Aggregation

What is Slow Protocol

When link aggregation and LACP are stand...
Must Know As a Network Engineer

OSI Reference Model and IP Set Model

What is OSI Reference Model and IP Set M...
Firewall

How Stateful Inspection Works

What is Stateful Inspection Stateful Ins...
TCP/UDP

Format of UDP

As mentioned before, UDPis light in load...
TCP/UDP

Reliability of TCP

TCP reliability is implemented with sequ...
TCP/UDP

TCP state transition

TCP has an attribute called " State " th...
TCP/UDP

TCP connection

The TCP connection starts with 3 way han...
TCP/UDP

TCP Options

TCP options is represented as following ...
TCP/UDP

TCP segment format

The communication data unit of TCP is of...
TCP/UDP

TCP / UDP Overview

TCP/UDP provides a communication channel...
IP

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

What is ICMP ICMP stands for Internet Co...
IP

What is IP address

IP address is the address on network com...
Routing

Broadcast routing

There are two types of IP broadcast. One...
Routing

Cause and avoidance design of routing loop

The routing loop is said the state that ...
Routing

Rule of routing #5 Recursive Routing

NextHop address of the routing is basica...
Routing

Rule of routing #4 Administrative Distance (AD)

About Administrative Distance (AD) Admin...
Routing

Rule of routing #3 Longest Match

Consider the network such as the followi...
Routing

Rule of routing #2 Packet Discarding

(In Layer 3, ) the cases that incomming ...
Routing

Rule of routing #1 Header rewriting

There was no particular change in the Et...
Routing

Routing table

In the memory of the NW devices of Layer...
Routing

Configuring Routing

Although switching can learn the MAC add...
Routing

Routing Overview

The Layer 2 defines communication direct...
Switching

Difference between MAC address table and ARP table

The difference between the MAC address t...
Grasp the network flow

Differrence between MTU & MSS, IP Fragmentation & TCP Segmentation

Difference between MTU & MSS MTU(Maximum...