Category: Networking

TCP 3-Way Handshake (SYN,SYN-ACK,ACK)

Host A sends a TCP SYNchronize packet to Host B

Host B receives A’s SYN

Host B sends a SYNchronize-ACKnowledgement

Host A receives B’s SYN-ACK

Host A sends ACKnowledge

Host B receives ACK.
TCP socket connection is ESTABLISHED.

tcp three-way handshake,syn,syn-ack,ack
TCP Three Way Handshake

Lists the administrative distance default values of the protocols that Cisco device supports below;

Routing protocol /Route source
Default Distance Values
Connected interface 0
Static route 1
Enhanced Interior Gateway Routing
Protocol (EIGRP) summary route
External Border Gateway Protocol (eBGP) 20
Internal EIGRP 90
IGRP 100
OSPF 110
Intermediate System-to-Intermediate System (IS-IS) 115
Routing Information Protocol (RIP) 120
Exterior Gateway Protocol (EGP) 140
On Demand Routing (ODR) 160
External EIGRP 170
Internal BGP 200
Unknown 255