ch04_updated_hw - Homework Updated January 2007 CHAPTER 4...

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Homework Updated January 2007 CHAPTER 4 Ethernet LANs L e a r n i n g   Ob je c ti v e s : Last Name: ____________________________________________________ First Name: ____________________________________________________ Due Date: __________________________________ Test Your Understanding 1. a) What is the dominant LAN technology today? b) Why did it become dominant? 2. a) What working group creates Ethernet standards? b) To what committee does this working group report? c) In what organization is this committee? d) Are there other working groups? e) If so, what do they do? f) Does this book use Ethernet and 802.3 interchangeably? g) Why would you expect Ethernet standards to be OSI standards? h) When do vendors begin developing products based on Ethernet standards? 3. a) At what layer is the 100BASE-TX standard? b) What can you infer from the name 100BASE-TX? c) Distinguish between baseband and broadband transmission. d) Why does baseband transmission dominate for LANs? e) What is 10/100 Ethernet? f) What is autosensing? Chapter 4-1
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g) What is Fast Ethernet? h) What is the most widely used 802.3 physical layer standard for connecting stations to switches today? i) What is the most widely used 802.3 physical layer standard for connecting switches to other switches today? j) Which versions did the 802.3 Working Group develop initially for WANs? 4. a) What is link aggregation (trunking or bonding)? b) Why may link aggregation be more desirable than installing a single faster link? c) Why may it not be desirable if you will need several aggregated links to meet capacity requirements? 5. a) How could you use Error: Reference source not found in network design? b) If more than one type of Ethernet standard in Error: Reference source not found can span the distance you need, what would determine which one you choose? c) In Error: Reference source not found, is the distance the maximum for a single physical link or for the end-to-end distance between two stations across multiple switches? d) At what layer or layers is the 802.3 100BASE-TX standard defined—physical, data link, or internet? e) How does regeneration allow a firm to create LANs that span very long distances? f) If you need to span 300 meters using 1000BASE-SX, what options do you have? (Include the possibility of using an intermediate switch.) g) How would you decide which option to choose? 6. a) Distinguish between the MAC and LLC layers. b) Does Ethernet have multiple physical layer standards? c) Does it have multiple MAC standards? d) What is the name of its single MAC standard? 7. a) What is the purpose of the preamble and start of frame delimiter fields? b) Why are Ethernet addresses called MAC addresses or physical addresses?
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