Annex C06 Application, Presentation, and Session Layer Functionality and Protocols Flashcards
Peer to Peer Network (P2P)
There are no dedicated servers, each computer acts as both a client and a server
Client/Server Network
Servers run the network services and clients must request permission for delivery of network resources
Client/Server vs P2P
Client Server architecture: centralized security, dedicated servers, easy access and config control, easy to backup
P2P architecture: small networks, inexpensive, easy setup, low maintenance
Hyper Text Transfer Protocol (HTTP)
Resides on web servers and contains info to render web pages on client servers. Texts, graphics, and animations when the web page is downloaded.
Port 80
File Transfer Protocol (FTP)
Port 20 and 21
Path for file transfer. Port 20 for actual files being transferred
Port 21 is for the overhead and control functions to ensure that the connection was properly set up and downloaded.
Unsecure/unencrypted file transfer
Simple Mail Transfer Protocol (SMTP)
Transfer of emails from client computers to email servers and to transfer mail between two email servers
Transfer email messages between email servers and between a client and an email server when the client is sending an email
Port 25
Post Office Protocol Three (POP3)
POP3 is used to pull messages from an email server
Port 110
Internet Message Access Protocol (IMAP)
Delivery from the server to the client
Port 143
Messaging Application Programming Interface (MAPI)
Microsoft proprietary protocol used between Microsoft Outlook and Exchange
Port 135
Domain Name Service (DNS) Protocol
DNS resolves IP addresses to fully qualified domain names
Port 53
Dynamic Host Configuration Protocol (DHCP)
DHCP allows client computers to automatically pull their IP address configuration from a centrally managed server
Port 67 and 68
Server Message Block (SMB) Protocol
Used by clients to access shared resources
Port 445
Telnet Protocol
Software that allows you to remotely access network systems
Port 23
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