T6 - LAN Interworking_Ans.pdf - Subject CCN2238 Data Communications and Networking Lab/Tutorial Session 6 LAN Internetworking(Solution Ethernet Wireless

T6 - LAN Interworking_Ans.pdf - Subject CCN2238 Data...

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CCN2238 Computer Networking Tutorial/Lab Page 1 Subject : CCN2238 : Data Communications and Networking Lab/Tutorial : Session 6 : LAN & Internetworking (Solution) Ethernet & Wireless LAN 1. An Ethernet MAC sublayer receives 42 bytes of data from the upper layer. How many bytes of padding must be added to the data? The minimum data size in the Standard Ethernet is 46 bytes. Therefore, we need to add 4 bytes of padding to the data (46 - 42 = 4) 2. An Ethernet MAC sublayer receives 1510 bytes of data from the upper layer. How many frames are needed to be sent? What is the size of each frame? The maximum data size in the Standard Ethernet is 1500 bytes. The data of 1510 bytes, therefore, must be split between two frames. The standard dictates that the first frame must carry the maximum possible number of bytes (1500); the second frame then needs to carry only 10 bytes of data (it requires padding). The following shows the breakdown: Data size for the first frame: 1500 bytes (=> frame size is 1518 bytes) Data size for the second frame: 46 bytes (with padding) (=> frame size is 64 bytes) 3. Do the MAC addresses used in an 802.3 (Wired Ethernet) and the MAC addresses used in an 802.11 (Wireless Ethernet) belong to two different address spaces? The addresses are selected from the same address space. For example, if locally there are one wireless and one wired device, they cannot have the same MAC address; addresses should be unique.
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CCN2238 Computer Networking
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