Network Services

Discussion about the ARP, DNS,DHCP, VPN,SSH,TELNET,FTP

VPN

VPN is a short for Virtual Private Network. It is a logical channel used to connect to a private network.

Why VPN?

  • It provides private communication channel over a public network.

  • Provides Security

  • Provides point to point connectivity

  • scalability

Features if VPN

  • Confidentiality

  • Data integrity

  • Authentication

  • Accountability

Types of VPN

  • GRE tunnel (provides point to point tunnel using ipx, apple talk)

  • IPSec VPN (CIA triad with authentication, software & hardware)

  • SSL VPN ( works on Application layer as software )

  • DMVPN (point to multipoint)

Broadly it is classified into two types

  • Site to Site VPN

  • Remote Access VPN

DHCP

  • Dynamic Host Configuration Protocol

  • It is a protocol that provides automatic ip address to the hosts.

  • It works on DORA process.

  • Discover, offer, Request and Acknowledge.

  • It works on UDP layer.

  • Previously it was called BOOTP(Bootstrap Protocol)

DNS

  • Domain Name System

  • DNS translates domain names to IP addresses so browsers can load Internet resources.

  • TLD (top-level Domain) like .com, .org, .gov etc

  • SLD (Second level Domain) like google.com, wikipedia.com etc

  • Subdomain (pjdeepakkumar.gitbook.io) here pjdeepakkumar is subdomain.

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