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ECE3076 HW-6 answers

ECE3076 HW-6 answers - Name(print Sec ECE3076 Fall 2009...

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Name (print) ______________________________ Sec. ________ ECE3076, Fall 2009 Email ____________________ HW-6 Due Friday, Nov. 20 (beginning of class) Email to your TA. These topics may be on the Exam. 1 . When you type "www.cnn.com" into your browser, what are the two hosts whose Ethernet addresses must be obtained if nothing is cached from previous operations? a. ______ gateway router __________ b. _____ ________local DNS server _____________ b. On an IP network, what protocol is used to obtain these MAC addresses? _____ ARP ________ 2 . Ethernet is called CSMA/CD, while WiFi is called CSMA/CA. MA stands for Multiple Access. a. What does CA mean ? ____ collision avoidance __________________________ b. What does it prevent? _____ lost frames due to a collision ________________________________ c. What does CD mean ? _____ collision detection ______________________ d. What does it prevent? _____ lost time due continued sending after the collision starts __________ 3. Hosts A , B, C, and D are connected directly to an Ethernet Switch X , whose forwarding table is empty. a. When A sends a frame to B, which hosts receive it? _____ A, C, D __________________ b. When B sends a reply to A, which hosts see it? __________ A ________________ c. If X were a Hub , which hosts would see the reply? _______ B, C, D _________________ 4. Unique Mac addresses are in ROM in each adapter card.
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