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Data link layer. Goals: ? Principles behind data link layer services. ? Error detection, correction. ? Sharing a broadcast channel: Multiple access. ? Link layer addressing . Bridges/switch: Forwarding. ? Forwarding: ? To which LAN segment should a frame be forwarded? ? Looks like a routing problem hub hub hub switch
Datalink – Bridging and Switching. Peter Steenkiste. Departments of Computer Science and. Electrical and Computer Engineering. Carnegie Mellon University. 15-441 Networking, Spring 2006 www.cs.cmu.edu/~prs/15-441. Peter A. Steenkiste, SCS, CMU. 2. Datalink Layer Architectures. 0 Multiple access networks.
The Data Link layerModule introduction On a networked computer, the Data Link layer protocol is responsible for the final packaging of data befor The hub.12. Token passing is used by several Data Link layer protocols. due either to the number of computers involved or the nature of the data to be shared. there is no
20 Sep 2001 11/23 The Data Link Layer. Internet solutions. Hubs and switches. • Twisted pair Ethernet hosts use a physical star configuration. • A hub repeats all traffic to all stations. • A switch learns which MAC addresses are in which physical ports and transmit only necessary traffic. — Security point: switches are
reliable data transfer, flow control: done! ? instantiation and implementation of various link layer technologies. Last time. ? link layer services. ? error detection, correction. ? multiple access protocols and. LANs. ? link layer addressing, ARP,. DHCP. Today. ? Ethernet. ? (Token Ring and FDDI). ? hubs and switches. ? PPP.
5: DataLink Layer 5a-5. 5: DataLink Layer. 5-5. Switches and Bridges. ? link-layer device: smarter than hubs, take active role. ? store, forward Ethernet frames. ? examine incoming frame's MAC address, selectively forward frame to one-or-more outgoing links when frame is to be forwarded on segment, uses CSMA/CD to
Digital Communication in the Modern World. Data Link Layer: Ethernet, Switches and Hubs www.cs.huji.ac.il/~com1 com1@cs.huji.ac.il. Some of the slides have been borrowed from: Computer Networking: A Top Down Approach Featuring the Internet,. 3nd edition. Jim Kurose, Keith Ross. Addison-Wesley, July 2004.
9 Apr 2003 receiver identifies and corrects bit error(s) without resorting to retransmission. 5: DataLink Layer. 5a-5. LAN technologies. Data link layer so far: ? services, error detection/correction, multiple access. Next: LAN technologies. ? Ethernet. ? hubs, bridges, switches. ? 802.11. ? PPP. ? ATM. 5: DataLink Layer.
Chapter 5 outline. I 5.1 Introduction and services. I 5.2 Error detection and correction. I 5.3Multiple access. I 5.6 Hubs, bridges, and switches. I 5.7 Wireless links and. LANs. I 5.8 PPP. 5: DataLink Layer 5a-3. I 5.3Multiple access protocols. I 5.4 LAN addresses and ARP. I 5.5 Ethernet. I 5.8 PPP. I 5.9 ATM. I 5.10 Frame Relay
individual LAN restrictions pose limits on number of nodes in same collision domain and on total allowed geographical coverage; cannot connect different Ethernet types (e.g., 10BaseT and 100baseT) Why? #6. Bridges. Link Layer devices: operate on Ethernet frames, examining frame header and selectively forwarding
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