ip網(wǎng)絡技術基礎系統(tǒng)方法課件08syllabus

1、Abbreviations:Acronyms: P743Chapter 1:1. Topologies, 2. Connection Strategies Circuit Switching, Packet SwitchingA. DatagramB. Virtual CircuitC. Source Routing3. Multiplexing4. TDM, FDM, Statistical TDM, WDM5. OSI modelthe Internet model6. Performance Metrics Bandwidth Latency = Propagation + Transm

2、it + Queue Delay x Bandwidth Product7.作業(yè)作業(yè)Chapter 2:1.Links Conducted media, Optical fiber, Wireless2.Encoding NRZ, Manchester, NRZI3.Reliable Transmission Stop-and-Wait Protocol, Go-Back-N Sliding Window Protocol4. MAC Protocol Channel Partitioning by time, frequency or code TDMA, FDMA, CDMA Taking

3、 Turns Random partitioning (dynamic), A. ALOHA: pure ALOHA, slotted ALOHAB. CSMA: non-persistent, p-persistent(0p1)C. CSMA/CD used in EthernetD. CSMA/CA used in WiFi (WLAN)E.Binary Exponential Backoff strategya.At each retransmission, choose randomly from among a discrete set of values within expone

4、ntially increasing wait time (02r-1), r=min(n,10)b.Retransmit a finite n of times, 16 for example 5.Bus (Ethernet)6.Token ring difference between 802.5 &FDDI7.Wireless Networks Bluetooth-802.15.1, WiFi-802.11, WiMAX-802.16, 3G作業(yè)作業(yè) Transceiver Interface between the PC and the cable Detects idle b

5、ackbone Listens for collisions Puts bits on cable from interface card Passes received bits to interface cardEthernet Transceiver cable (AUI cable) 5 twisted pair 2 pair for sending data and control 2 pair for receiving data and control 1 pair for powerEthernet Network Interface Card (NIC) Receives p

6、ackets from PC software Formats frames Executes binary exponential backoff algorithm if required Detects incoming frames for itself Performs CRC error checking Has a hardware address收？收？發(fā)？發(fā)？Ethernet1.Frame FormatNOTE: This is DIX frame. The difference with 802.3 is the type field is changed as lengt

7、h field.1.Addresses unique, 48-bit unicast address assigned to each adapter broadcast: all 1s multicast: first bit is 1 Every Ethernet host has a unique address, burned into ROM by manufacturer Each manufacturer is given a unique prefixWHY?Ethernet1. Bandwidth: 10Mbps, 100Mbps(Fast Ethernet), 1Gbps2. Length: 2500m (500m segments with 4 repeaters)EthernetBACK1. How much bandwidth2. Which part of the electromagnetic spectr