Focusing on Infrared Spectroscopy, which of the following molecules would have a strong broad signal sweeping from 3400 to 2700cm-1 that significantly interferes with the rest of the signals expected in that range?

I have read the syllabus for this course, watched the corresponding syllabus video, and understand it fully.

How will the host A on Subnet 1 discover the host B on Subnet 2. Show the entry for host B in the ARP table of A.  

Bob wants to identify himself to Alice. Bob has a public-private key pair but Alice does not. Explain what simple method can they use to achieve this authentication.    

Alice and Bob use encryption for the confidentiality of their messages. However, they are concerned about their messages being tampered with by Trudy and whether it’s not Trudy they are communicating with rather than with each other. In this context answer the following questions: a) Can encryption alone address their confidentiality, integrity and authentication concerns? Explain your answer. b) Their network manager suggests that they use the Message Authentication Code (MAC). In this regard, explain which of the two concerns mentioned in part a) will MAC be able to address. c) What flaw in MAC prevents it from holding up in a court of law?  

A section of an organizations LAN is shown in the figure below:  Answer the following questions for the given LAN section: a) When the Host H2 is first switched on, its ARP table is empty. How will it discover H1? b) After some time, the ARP table of H2 shows the following entries IP Address Mac Address Type Interface Age 10.1.1.21 1A-2F-BB-76-09-AD Dynamic F1/02 600 192.1.68.23 A4-B9-00-16-CC-4D Static – – 10.1.1.254 00-1D-7F-F8-23-D5 Dynamic F1/06 600 What does static entry signify and how is a static entry useful? c) After a while H2 needs to communicate with H3. Explain how it will discover the MAC address of H3 and fill up a possible entry in the table. d) After some time H2 notices that the entry for H1 has changed as shown below. Explain what is going on (H1’s original MAC address has not changed). IP Address Mac Address Type Interface Age 10.1.1.21 B4-3D-C2-46-10-A1 Dynamic F1/02 600 192.1.68.23 A4-B9-00-16-CC-4D Static – – 10.1.1.254 00-1D-7F-F8-23-D5 Dynamic F1/06 600  

Give two reasons why CSMA/CA and not CSMA/CD is used for wireless LANs.

What is the reason for MAC not providing non-repudiation? How can this problem be solved?

Explain one important feature of MPLS that help it provides traffic engineering.

Dr. Angco is studying whether children who did things like bang their heads on walls or scratch their arms with their fingernails when they were between the ages of three and six are the same ones who cut themselves to relieve tension during adolescence. Dr. Angco uses which approach?