computer networks author andrew s tanenbaum

... communication does not have these phases It just sends the data 14 Message and byte streams are different In a message stream, the network keeps track of message boundaries In a byte stream, it does not ... so to speak (assuming it fits) 20 With n layers and h bytes added per layer, the total number of header bytes per message is hn, so the space wasted on headers is hn The total message size is ... =1 This expression reduces to l = n − The mean router-router path is thus 2n − 10 Distinguish n + events Events through n consist of the corresponding host successfully attempting to use the

Ngày tải lên: 04/11/2019, 12:29

... devices  Equipment that connects directly to a network segment is referred to as a device.  End-user devices : They include computers, printers, scanners, and other devices that provide services ... connections. In other words, they take a group of hosts and allow the network to see them as a single unit. This is done passively, without any other effect on the data transmission. Active hubs not ... (LANs)  Wide-area networks (WANs)  Metropolitan-area networks (MANs)  Storage-area networks (SANs)  Virtual private network (VPN)  Benefits of VPNs  Intranets and extranets  2.2 Bandwidth 

Ngày tải lên: 22/10/2013, 16:36

... standards  Wireless devices and topologies  How wireless LANs communicate  Authentication and association  The radio wave and microwave spectrums  Signals and noise on a WLANs  Wireless security ... these static electrons have an opportunity to jump to a conductor, this can lead to electrostatic discharge (ESD).  ESD, though usually harmless to people, can create serious problems for sensitive ...  Single-mode fiber  Other optical components  Signals and noise in optical fibers  Installation, care, and testing of optical fiber  3.3 Wireless Media  Wireless LAN organizations and standards

Ngày tải lên: 22/10/2013, 16:39

... Various symbols are used to represent media types.  Each media has advantages and disadvantages.  Some of the advantage or disadvantage comparisons concern:  Cable length  Cost  Ease of installation ... Repeaters  Hubs  Wireless  Bridges  Switches  Host connectivity  Peer-to-peer  Client/server  5.2 Cabling the WAN  WAN physical layer  WAN serial connections  Routers and serial connections ... the end user ?  GE to the desktop is not a standard installation now.  Ethernet technologies in campus network  User level (10Mbps) / Clients or servers (100Mbps)  link between user and network

Ngày tải lên: 22/10/2013, 16:41

... 10-Mbps Ethernet (cont.)  The four common features of Legacy Ethernet (cont.) :  The same transmission process  SQE (signal quality error), it is always used in half-duplex. SQE can be used ... any two distant stations.(只有三個 segments 可接電腦） 2008/7/19 6 5-4-3 rule 2008/7/19 7 10BASE5  A single thick coaxial cable bus.  10BASE5 is the first medium used for Ethernet.  Manchester encoding ... Technologies 2008/7/19 2 Outline  10-Mbps and 100-Mbps Ethernet  10-Mbps Ethernet  10BASE5  10BASE2  10BASE-T  10BASE-T wiring and architecture  100-Mbps Ethernet  100BASE-TX  100BASE-FX  Fast

Ngày tải lên: 22/10/2013, 16:42

...  Host C processes the ping request and transmits a ping reply back to Host A.  The address of Host C is added to its bridge table.  When Host D transmits data, its MAC address will also be ... of Host A is added to its bridge table.  The address of Host B has not been recorded yet as only the source address of a frame is recorded.  Host B processes the ping request and transmits a ... Host A.  The address of Host B is added to its bridge table.  Host A is now going to ping Host C.  The address of Host C has not been recorded yet as only the source address of a frame is

Ngày tải lên: 22/10/2013, 16:44

... protocols  10.3 The Mechanics of Subnetting  Classes of network IP addresses  Introduction to and reason for subnetting  Establishing the subnet mask address  Applying the subnet mask  Subnetting ... network-addressing scheme.  IP is a connectionless, unreliable, best-effort delivery protocol.  The term connectionless means that no dedicated circuit connection is established prior to transmission as ... Protocols  Routing overview  Routing versus switching  Routed versus routing  Path determination  Routing tables  Routing algorithms and metrics  IGP and EGP  Link state and distance vector

Ngày tải lên: 22/10/2013, 16:46

... area wireless networks are also being developed The initial focus is high-speed wireless Internet access from homes and businesses, bypassing the telephone system This service is often called ... the server process. The client process then waits for a reply message. When the serv- SEC. 1.1 USES OF COMPUTER NETWORKS 5 er process gets the request, it performs the requested work or looks up ... term. Home shopping is already popular and enables users to inspect the on-line cata- SEC. 1.1 USES OF COMPUTER NETWORKS 9 logs of thousands of companies. Some of these catalogs will soon provide

Ngày tải lên: 29/04/2014, 15:10

... agent- based simulations generate many of the same resultsÑsuch as the tendency of inheritance rules to suppress natural selection and make populations more susceptible to diseaseÑthat scientists have ... also indicated that mental disorders such as AlzheimerÕs disease may be associated with exces- sive periodicity, Freeman says. SchiÝ emphasizes that many ques- tions remain about the causes ofÑlet ... quantum me- chanics is, ÒWhich of those conditions does your version fail to satisfy?Ó Grif- ÞthsÕs theory, unless I somehow mis- understand it, satisÞes them all. Mixed Grades The subheadline for

Ngày tải lên: 12/05/2014, 14:59

... pairs of senders/receivers share the same physical link to communicate A switch is multiplexing packets from different senders into one packet stream... Multiplexing S1 S2 S3 S1 S2 S3 S1 S2 S3 ... access: All nodes share the same physical medium point-to-point multiple access 29 Switched Networks Circuit-Switched terminal/ host A dedicated circuit is established across a set of links ... address seq number, etc) Packets traverse the network individually Use the destination address to forward packets May use more than one routes, nodes may store packets temporarily 34 Advantages

Ngày tải lên: 24/10/2014, 13:22

... distributed system. In this thesis, we consider the problem of load balancing in distributed systems. Specifically, we consider balancing indivisible loads across the network nodes so as to achieve ... with some kinds of start-up costs [90]. When these nonlinear functions are used in DLT, there are several open questions, such as, “does Rule A (optimal sequence) still hold?”, “what is the speedup?”, ... real distributed systems, when a divisible load arrives, some of the nodes in the system may be occupied by other divisible load under processing. In this case, we must consider the release time

Ngày tải lên: 16/09/2015, 15:54

... a single session. This solution is usually trivial. Moving on to the second stage, the problem faced becomes two dimensional because it now consists of two sessions. At this stage, DP makes use ... congestion responsive ones, such as Transmission Control Protocol (TCP) flows. This thesis addresses the key deficiencies of the best-effort paradigm through the proposal of an original service differentiation ... throughout my studies. He was the one who convinced me to get a doctoral degree and this thesis is a result of his successful persuasion and mentoring. My time at the Computer Communication Networks Laboratory

Ngày tải lên: 17/09/2015, 17:20

... this course  Easy: attend ALL lectures and ALL assignments  Do your assignments individually  Do NOT miss any Bonus Quiz (i.e., not miss class)  Some hw problems will be solved in class: ... layers, service models Delay & loss in packet-switched networks Chapter 1, slide: 10 Exercise Transmission vs propagation L=100Bytes Host A Question: trans rate R = ? Host B distance = km, speed ... a=64Kbps groups bits into L=48Byte packets sends packet to Host B as soon it gathers a packet Host B  As soon as it receives the whole pckt, it converts it to analog Question:  How much time elapses

Ngày tải lên: 04/12/2015, 20:36