Computer Networks
Tutorial #10
- What are some of the characteristics of multi-access LANs which
distinguish them from the point-to-point data links of last lecture?
- What does CSMA/CD mean? CSMA/CD is sometimes referred to as the
"polite dinner table" algorithm? Can you think of a reason for this?
- What is interesting about the Ethernet/802.3 address format?
- Ethernet/802.3 is a shared medium LAN technology. Does this pose any
potential security risks? Explain.
- In the lecture, it was stated that an Ethernet/802.3 collision occurs when two
stations start to transmit at the same time. Discuss the meaning of the
term at the same time as used in this context.
- In slide 6 of today's lecture, it is stated that the key difference between
Ethernet and IEEE 802.3 LANs is the meaning of the 16 bit "type" field
(used as a "length" field in 802.3). In many LANS, Ethernet and 802.3
frames co-exist perfectly happily. How can a receiving station know
whether to treat the field as a length or as a type?
- The 10baseT configuration has captured the Ethernet market from thin
wire. Discuss reasons why network planners and managers might
prefer this technology.
- Even though 10baseT Ethernet LANs are physically cabled as
point-to-point networks, they are different to the point-to-point links of last
lecture in a fundamental way. What is this?
- Research question: Modern "high-end" 10BaseT hubs are usually based on
switching technology, which increases performance significantly over
simpler "repeater"-style hubs. How does this work?
- Research question: What is the historical origin of the difference
between Ethernet and IEEE 802.3?
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Phil Scott