(N1) Networking Basics part5 OSI Layer 2
20220919 165848
4 – Transport
-provide end to end connectivity
-Segmenting - chop data into small pieces - 64-1500 bytes
-Numbering and Sequencing - order – error correction
-hello how are you –at destination - hello how you –are ¾ missing
1/4 2/4 3/4 4/4 source send ¾ again - hello how are you -
-Multiplexing and demultiplexing of protocols into TCP and UDP
-Flow control / Windowing
–source estimate the destination receiving packet capacity at a time
–pdu - packet data unit - data in any layer called pdu
-TCP Header + PDU = Segment –PDU
-TCP header – segmenting,numbering, protocols(tcp/udp)
-segment sent to network layer
3 – Network
-routed protocols -ip address
-routing protocols -igp -ripv2,eigrp, ospf, egp - bgp, is-is
-Nw header + Segment = Packet –PDU
-Nw header = Source IP + Destination IP
-packet sends to data link layer
2 – DataLink
-LLC - Logical Link Control:
-WAN protocol: PPP, HDLC, frame relay, MPLS
-MAC - Media Access Control:
-Data Header + Packet + Data tail
-S mac + D mac + Packet + CRC = Frame
-CRC - Cyclic Redundancy Check – error checking
-Frame send to Physical layer
1 – Physical
-Frame is converted into bit stream
-bit stream again converts into Electrical signal, Radio Signal or Lightwave based on media
-Ethernet - UTP/STP - electrical signal
-Wifi - Radio signal - 2.4GHz , 5GHz
-Fiber Channel - Lightwave signal
Видео (N1) Networking Basics part5 OSI Layer 2 автора iPhone Wizards
Видео (N1) Networking Basics part5 OSI Layer 2 автора iPhone Wizards
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