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Download Practice Midterm Exam - Data Communications | EE 5330 and more Exams Data Communication Systems and Computer Networks in PDF only on Docsity!
awa AR nn arinie renin a ae DATA CONnviiiihcA ThaIva bibaaou Shade Code: ECE Department Show all your work!! READ the entire exam carefully! This exam has 3 major problems with a total of 100 points. Answer in the same page and continue in the back if needed. ' Problem 1 30 Points A digital link that transmits Ethernct packets has the format shown in the figure below. The typical IEEE802.3 MAC address consists of 48 bits (6 Bytes), 24 identify the manufacturer and the remaining 24 identify the individual device This information ts burned in a firmware at the factory The Internet Protocoi (iP) address has 32 bits, usually the first 24 are used to identify the network and sub- network. The remaining 8 bits identify the host and it is assigned by the network administrator. a) 7p For that system explain the function of the computed Frame Check Sequence (FCS) b) 7p Explain which fields might be included in the header, the payload and the flags. c} 8p Why, do you think, the destination address is always located before the source address? d) 8p Why the IP is more appropriate for worldwide delivery of a packet compared to the MAC address? cRC | | Start ls Bisel e | Frame | frame | Destination oUrce | check Preamble | geimiter | address | address | Lengin Date/PAD area bee em | eS stres): 7 Bytes 1 Byte 46-1500 Bytes 4 Bytes LsB se Bit order of i ] | | | | | transmission #—- D0 | D1 | O23 D4 | OS DB | D7 | LSB first Pec iolna ta ele tees es (b)