Question

In: Computer Science

What’s true about shared and/or switched Ethernet LANs. a. a full-duplex (FDX) shared Ethernet LAN does...

What’s true about shared and/or switched Ethernet LANs.

a. a full-duplex (FDX) shared Ethernet LAN does not require CSMA/CD

b.  switched Ethernet LANs do not experience data collisions because they operate as centralized/deterministic networks

c. each node connected to a shared Ethernet LAN must read destination addresses of all transmitted packets to determine if it belongs to them

d.  switched Ethernet LANS are connected to nodes through dedicated links and therefore do not need to determine destination addresses of incoming packets

Solutions

Expert Solution

Solution :

(a) a full-duplex (FDX) shared Ethernet LAN does not require CSMA/CD
= TRUE. Because there is no contention for use of a shared medium, the multiple access algorithms (i.e., Carrier Sense with Multiple Access and Collision Detect, or CSMA/CD) are unnecessary.
(b) switched Ethernet LANs do not experience data collisions because they operate as centralized/deterministic networks
= FALSE. Because in switched Ethernet, collisions do not occur in the channel due to the presence of a dedicated connection to each station. However, collisions may still occur in a destination port if it receives frames from more than one port simultaneously. And most importantly Ethernet is a decentralized control using a non-deterministic access method.
(c) each node connected to a shared Ethernet LAN must-read destination addresses of all transmitted packets to determine if it belongs to them.
=FALSE. A shared Ethernet LAN means that all members of the network are contending for transmission of data onto a single network (collision domain); individual members of a shared network get only a percentage of the available network bandwidth.
(d) switched Ethernet LANs are connected to nodes through dedicated links and therefore do not need to determine destination addresses of incoming packets.
= TRUE. In Switched Ethernet LANs, each station gets a dedicated connection. Switches make sure that each packet is delivered only to the host to which it is addressed.


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