13-NetworkArchitecture

13-NetworkArchitecture - CSE 265: System and Network...

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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison CSE 265: CSE 265: System and Network Administration System and Network Administration Network Architecture Hardware Routing Getting connected Centralization/decentralization Network topology Network debugging tools
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Networking hardware Networking hardware Ethernet is the core of most networks 10 Mbit 10Base2, 10BaseT 100 Mbit 100BaseTX 1 Gbit 1000BaseT Many competing LAN technologies ATM, Token Ring, FDDI Wireless 802.11b/a/g
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Connecting ethernets Connecting ethernets Hubs/repeaters (physical layer) Retimes and reconstitutes Ethernet frames to all ports Single collision domain Switch (link layer) Receives, buffers, and retransmits packets Separate collision domains Learns locations of MAC addresses, selectively forwards frames Router (IP/network layer) Connects separate ethernet networks Can connect different LAN/WAN technologies
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Routing Routing Given a packet, on which of multiple network interfaces should it be sent? UNIX kernel keeps routing table (netstat -rn) Sample from dual-homed host Kernel IP routing table Destination Gateway Genmask Iface 128.180.98.128 0.0.0.0 255.255.255.128 eth0 192.168.0.0 0.0.0.0 255.255.0.0 eth1 127.0.0.0 0.0.0.0 255.0.0.0 lo 0.0.0.0 128.180.98.248 0.0.0.0 eth0
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Routing continued Routing continued Routing is static for most systems Established when network card configured Additional static routes can be added using the route command Dynamic routing can be managed using routed or gated
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Connecting to the Internet Connecting to the Internet How can you connect your network to the Internet?
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Connecting to the Internet
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13-NetworkArchitecture - CSE 265: System and Network...

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