Bob Packet – The “Local Boy” Bob is a ‘PING’ request that will travel from 172.10.1.20 to 172.10.1.30. Subnet Mask is 255.255.255.0 .20 Compares its Network ID (172.10.1) with that of the Destination IP (172.10.1) and sees they are a match. .20 sends an ARP (Address Resolution Protocol) asking for the MAC address of the ..
Category : CCENT
How Port Numbers Work Every time an applications communicates across a network, it must decide both the source and destination port numbers. If 10.1.1.1 wants to access 150.1.1.1’s web server, it will use well known port 80. This is written as 150.1.1.1:80 When written in this notation, it is known as a “Socket”. The Source ..
Understanding the Differences Between TCP and UDP Networks communicate in Layers. This is handled in Layer 4, Transport Layer TCP is “Reliable” Reliable – Uses Acknowledgements Builds Connections with system it is communicating with Uses Sequence Numbers – Every packet is tagged with a # to know the order the packets had been sent. UPD ..
How does OSI Model and TCP/IP Relate OSI was a competing model with TCP/IP in the 70’s It failed because addresses were too complex. Using HEX values and people never thought they would need that many. OSI MODEL is used to explain, but TCP/IP is actually in use. Actually very similar to new IPv6 Protocols ..
Process Definition Application Provides an interface that allows applications to communicate across a network. Presentation “Generifies” the data. Makes the data generic and compliant to standards. Also includes generic encryption services. Session Starts and ends a session. Logically keeps all sessions separate. Transport Defines how the data is sent. Reliably (TCP) or Unreliably (UDP – ..
A network is a system that allows applications to communicate. Can be though of as the network of roads that tie cities, buildings and people together. Definitions Network Speed: Default measured in Bits Per Second bps. To get bytes per second, divide by 8. bit (b): 0 or 1 byte (B): 8 bits Kilobyte (KB) ..
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