Index

COMPUTER NETWORKING

  1. INTRO
    1. TCP/IP Five Layer Model
    2. NETWORKING DEVICES
    3. PHYSICAL LAYER
    4. DATALINK LAYER
  2. NETWORK LAYER
    1. IP
    2. SUBNET
    3. ROUTING
  3. TRANSPORT & APPLICATION LAYER
    1. TRANSPORT LAYER
    2. CONTROL FLAGS
    3. APPLICATION LAYER
    4. ALL TOGETHER
  4. NETWORK SERVICES
    1. DNS - NAMES RESOLUTION
    2. DHCP
    3. NAT
    4. VPN
  5. CONNECTING TO INTERNET
    1. BROADBAND
    2. WAN
    3. WIRELESS NETWORKING
  6. TROUBLESHOOTING
  7. MORE ABOUT
    1. DNS
    2. IPv6
    3. CLOUD

DNS

DNS

:


Name Resolution Tools :
nslookup : output displays what server is used and resolution..
images/29-1.png

Public DNS servers :
Name servers specifically set up so that any one can use that for free.
Level 3 communication -> 4.2.2.1 -4.2.2.6
Google -> 8.8.8.8,8.8.4.4
Available thru anycast

DNS Registration and expiration :
Registrar - organization responsible for assigning individual doamin names to other individuals,orgs
Hostfiles : a flat file - network address ,server
Loopback Address : A way of sending network traffic to ur self.
127.0.0.1 <->IPv4. Almost every os has a host file contains this