Computer Networks - II : TYBCS : SPPU : Syllabus

Chapter 1 : Application Layer 

Domain Name System

 Name space-Flat name space, Hierarchical name space

 Domain Name Space -Label ,Domain name, FQDN,PQDN

 Distribution of Domain Name Space-Hierarchy of name servers, zone, Root

server, Primary and secondary servers.

 DNS in the Internet: Generic domains, Country domains,inverse domain

 Resolution-Resolver,mapping names to address,mapping addresses to

names,recursive resolution,iterative resolution,caching

Electronic Mail-

 Architecture-First scenario, second scenario, Third scenario, Fourth scenario

 User agent-services of user agent, types of UA Format of e-mail

 MIME-MIME header

 Message transfer agent-SMTP

 Message Access Agent: POP and IMAP

File Transfer

FTP-Communication over data control connection,File type,data

structure,Transmission mode,anonymous FTP

Chapter 2 Multimedia 

Digitizing audio and video, Audio and Video compression

Streaming Stored audio/video

 First approach

 Second approach

 Third approach

 Fourth approach

Streaming live audio/video

-Real time interactive audio/video- Characteristics, Time relationship, timestamp,

-Playback buffer, ordering multicasting, translation

RTP-Packet format

RTCP-Message types

Voice over IP-SIP,SIP sessionH.323-

Architecture, Protocols

Chapter 3 Cryptography and Network Security 

Terminology: Cryptography, plain text and cipher text, cipher key, categories of

cryptography-Symmetric key, asymmetric key

Encryption model

Symmetric key cryptography

 Traditional ciphers – substitution cipher, shift cipher, Transposition cipher

 Simple Modern ciphers-XOR, Rotation cipher, s-box,p-box

 Modern round ciphers-DES

 Mode of operation-ECB,CBC,CFB,OFB

Asymmetric key cryptography-RSA

Security Services

 Message confidentiality-With Symmetric key cryptography, with asymmetric

key cryptography

 Message integrity-Document and fingerprint, message and message digest

 Message authentication-MAC,HMAC

 Digital signature

 Entity Authentication-Passwords, Fixed passwords challenge-response

Chapter 4 Security in the Internet 

IPSecurity(IPSec)

 Two modes

 Two security protocols

 Services provided by IPSec

 Security association

 Internet key exchange

 Virtual private network

SSL/TLS

 SSL services

 Security parameters

 Sessions and connections

 Four protocols

 Transport layer security

PGP

 Security parameters

 Services

 PGP algorithms

 Key rings

 PGP certificates

Firewalls

 Packet filter firewall

 Proxy firewall