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From the moment you start, you will get down to the garage (“transmission delay”), drive to the bank (“propagation delay”), wait in the line (“queuing delay”), get served at teller’s window (“processing delay” or “service delay”), and drive to home (additional “propagation delay”). The first delay type is transmission delay, which is the time that takes the sender to place the data bits of a packet onto the transmission medium. In other words, transmission delay is measured from when the first bit of a packet enters a link until the last bit of that same packet enters the link.

The layer functionality is as follows: Layer 7 – Application: Its function is to provide application-specific services. 2), mail services for e-mail forwarding and storage (SMTP protocol), and directory services for looking up global information about various network objects and services (LDAP protocol). Notice that this layer is distinct from the application itself, which provides business logic and user interface. Layer 6 – Presentation: Its function is to “dress” the messages in a “standard” manner.

Ivan Marsic • 46 Rutgers University STA 1 STA 2 Both stations are listening t1 Time STA1 begins transmission t2 STA2 begins transmission t3 STA2 detects collision and transmits jam signal t4 STA1 detects collision before ending transmission t5 Figure 1-31: Collision detection by CSMA/CD stations. It is important to realize that collision detection is an analog process. The station’s hardware must listen to the cable while it is transmitting. If what it reads back is different from what it is putting out, it knows that a collision is occurring.

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Computer Networks: Performance and Quality of Service by Ivan Marsic

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