Chapter 3- Network Protocols And Communication Flashcards
Decoding
Reverses the process in order to interpret the information
Encapsulation and decapsulation
Place one message format (letter) inside another message format (envelope). Decapsulation reversed by recipient and letter is removed from envelope
Segmenting
Host breaks long message into individual pieces that meet size requirements . Each segment is encapsulated in a seperate frame with address information and send over network
Unicast
Referred to as One to one delivery . It’s when only one way to send message
Multicast
Delivery Same message to group of host destination simultaneously
Broadcast
All hosts on network need to receive messages at the same time
Protocol suite
Used for communication Used by hosts and networking devices in software hardware or both
Protocol stack
Individual protocols within suites are implemented. The protocols viewed by layers each higher level service depends on function shown by protocols low level - they move data over network and provide a service to upper layer - message should be sent
Name Network protocols
IP , HTTP, DHCP
Application protocols
Known as HTTP is hypertext transfer protocol shows web server and web client interact ( requests and responses ) and delivers the Content of message and rely on other protocols to manage how message transported
transport control protocol (TCP)
manages individual conversations between web server and web client. it divides HTTP and anything it wants to transmit . messages into smaller bits called segment which are sent between web server and client processes running at destination host. Also control size and rate for messages sent
Internet protocols (IP)
Takes format segments from TCP encapsulating them into packets and giving them right address and deliver them to correct path to destination host
Network access protocol between data link and physical transmission of data on network media
Data link protocol take packets from IP and format them to be transmitted over media . Physical media shows how signals are sent and interpreted by receiving clients example Ethernet
Message encoding
Before u send message u encode it . It converts the information into another acceptable form for transmission
Rules broadcast
Switch can be known as broadcasts
Trap messages
When event occurs causes the device to send smnp trap such as power outrage and security breaches
Routing protocols used in network layer
RIPV2, OSPF, EIGRP
Ipconfig located
ICMP
Domain name system or services
Translates the domain names such as Cisco. Com into IP address
Benefit of IP address
Reduces error and saves time. DHCP- service- protocol Static- manually
TCP/IP port number
DNS- 53 DHCP- 67/68. Pop3- 110 receive emails FTP- 32 mega or less 20/21. SSH- 22 Telnet-23. NTP- 123. Remote Desktop - 3389 IMAP- 143. SMTP- sending emails 25 HTTP-80
