CS 6843 Spring; 2021 Final Exam
Submit your exam in one file with your last name, first as the name of the file. Also put your
lastname, firstname as the first line of your answer sheet. Type your answers so I can read them!
1) Wireless 102.11i
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The Ethernet addresses of the AP1, AP2, Router and Host are respectively Mac1, Mac2, MacR and MacH. The IP address of the router is IPR
a) (5 pts) What values are in the ARP table of the host when it is associated with AP1?
b) (5 pts) What values are in the ARP table of the host after it moves and is associated with
c) (5 pts) 802.3 can detect frame collisions while 802.11 is not. Why?
a) (5 pts) In MPLS what is a circuit and how is it created? Be specific and refer to protocols.
b) (5 pts) Why is label switching more efficient the routing?
c) (5 pts) Why is routing more flexible than label switching? Or is it?
3) (5 pts) What netmask is used to specify an IP Multicast Group.
4) (10 pts) for a multicast group consisting of one source and two listeners, all within the same IP
subnet; for each IP packet sent out by the source how many IP multicast packets are generated
for the listeners? How many Ethernet Multicast frames are generated? Explain.
5) (5 pts) Explain how the Administrative Address is set in OSPF.
6) Explain what the IP address 0.0.0.0 means in the following and give examples.
b) 7) In a) b) c) d) e)
(5 pts) DHCP
(5 pts) OSPF DNS:
(5 pts) What is an A record and how is it used?
(5 pts) What is a NS record and how is it used?
(5 pts) What is a PTR record and how is it used?
(5 pts) What is a MX record and how is it used?
(10 pts) Describe Recursive vs Iterative DNS?
(5 pts) Describe a situation where one might be more favorable than the other. (5 pts) In your DNS lab, was your DNS server authoritative for cnlab? Explain.
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