3CDH Networking Friday, 24th May 2013

Rather than the usual post I posted little notes I wrote in class:

Firewall/ Int / Ext NIC

Smoothwall

IP cop

m0n0wall

Source port determines which internal computer message goes to

POP downloads mail and deletes mail

IMAP downloads mail and leaves it on server

IMAP - 143

POP - 110

SMTP - 25

Popular ports - 1 to 1023

Registered ports - 1024 to 49151

Unregistered ports - 49152 to 65535

OSI Model

Application

Presentation - encoding and encapsulation

Session - 

Transport - TCP UDP

Network - IP

Datalink - Ethernet

Physical

TCP/IP

Application

Transport

Internet

Network

A record - web resolve

MX record - Mail exchange records

DNS TTL checks root domain servers if it is serving current records

DNS can be run alongside with

Proxy

firewall

DHCP

NAT