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Commputer network - Coggle Diagram
Commputer network
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Protocols (TCP/IP, HTTP, FTP, etc.)
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Tier-1 ISPs, Regional ISPs, IXP
1.4 Delay, Loss, Throughput
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Internet Stack (5 layers: Application, Transport, Network, Link, Physical)
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Malware (virus, worm, spyware)
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Web (HTML, Mosaic, Netscape)
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HTTP methods: GET, POST, HEAD, PUT, DELETE
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FTP commands: USER, PASS, LIST, RETR, STOR
Port 21 (control), Port 20 (data)
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Hierarchical structure: Root, TLD, Authoritative
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DNS record types: A, NS, CNAME, MX
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DNS poisoning, DDoS attacks
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BitTorrent (chunks, tit-for-tat, optimistic unchoking)
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No reliability, ordering, or congestion control
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Segment structure (seq #, ack #, flags)
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Closing connection (FIN, ACK)
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AIMD: Additive Increase, Multiplicative Decrease
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Also known as: Ports, Line Cards
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Connected to network cables (Ethernet, Fiber)
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Run data link layer (L2) logic (e.g., Ethernet framing)
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Physical Layer (cabling, signals)
MAC Layer (frame parsing, error detection)
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May perform shaping, scheduling, and packet marking
🔍 Terms: MAC address, PHY, SFP, Ethernet, buffer, packet queue
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🔍 Terms: Lookup, FIB, ASIC, TCAM, NAT, DSCP, VLAN tag
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🔍 Terms: RIB, ARP, OSPF, BGP, RIP, route metrics, administrative distance
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Used for configuration, diagnostics, and monitoring.
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🔍 Terms: SNMP, syslog, CLI, NETCONF, ZTP (Zero Touch Provisioning)
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RAM: temporary storage for routing table, buffer queues
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🔍 Terms: TCAM, DRAM, EEPROM, flash, configuration register
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Runs router OS (e.g., Cisco IOS, Juniper JunOS, MikroTik RouterOS)
Manages routing protocols, updates FIB, handles exceptions
🔍 Terms: Kernel, scheduler, routing daemon, process switching
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Authentication protocols (RADIUS, TACACS+)
🔍 Terms: ACL, IPsec, NAT-T, VPN tunnel, packet inspection
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Frame is checked, error checked, then stripped
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Basics
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communication links
fiber, copper, radio, satellite
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