Please enable JavaScript.
Coggle requires JavaScript to display documents.
Modul 7: Application Layer, Albert William Santosa / 200710632 - Coggle…
Modul 7: Application Layer
Presentation and Session Layers
Three primary functions
Compression of the data
Encryption of the data for transmission and the decryption of data upon receipt by the destination
Coding and conversion of application layer data
Session Layer
Functions create and maintain dialogs between source and destination applications
Handles the exchange of information to initiate dialogs, keep them active, and to restart sessions
TCP/IP Application Layer Protocols
Internet Message Access Protocol (IMAP) – another protocol for email retrieval
File Transfer Protocol (FTP) - used for interactive file transfer between systems
Simple Mail Transfer Protocol (SMTP) - used for the transfer of mail messages and attachments
Bootstrap Protocol (BOOTP) - a precursor to the DHCP protocol, a network protocol used to obtain IP address information during bootup
Telnet - a terminal emulation protocol used to provide remote access to servers and networking devices
Domain Name Service Protocol (DNS) - used to resolve Internet names to IP addresses
Trivial File Transfer Protocol (TFTP) - used for connectionless active file transfer
Common P2P Applications
With P2P applications, each computer in the network running the application can act as a client or a server for the other computers in the network running the application
Applications
Shareaza
BitTorrent
eMule
Bitcoin
eDonkey
LionShare
The three parts of the URL
www.cisco.com - the server name
index.html - the specific file name requested
http - the protocol or scheme
DNS Message Format
NS - an authoritative name server
CNAME - the canonical name for an alias
A - an end device address
MX - mail exchange record; maps a domain name to a list of mail exchange servers
Examples top-level domains
.co - Colombia
.com - business or industry
.au - Australia
.jp - Japan
.org - non-profit organization
Albert William Santosa / 200710632