TELE 9752: Network Operations and Control
Term 3, 2022: Mid-Term Test

Question I [15 marks]: Provide short responses (no more than 2-3 sentences) to the
following questions (3 marks each):

a) Give three specific examples of what a network manager does on a daily basis.
Your examples need to be very specific and not general statements.

b) A modern home has many connected devices (laptops, smart-phones, smart-TVs,
security cameras, etc.). Briefly describe three things you will need to configure in
such a home network.

c) Describe why VLANs need to be configured in an enterprise network.

d) Briefly explain how a content distribution network (CDN) helps improve Internet
performance for end users. If you were managing a CDN, what performance
metrics would you need to monitor?

e) Network management is moving from using SNMP/MIB to Netconf/YANG.
Briefly describe what this change means in terms of the skills needed by the
network manager.

2
Question II [15 marks]: The IP address table lists the IP addressing information for each
interface on a network device. It has the following structure:

ipAddrTable {1.3.6.1.2.1.4.20}
ipAddrEntry (1)
ipAdEntAddr (1) ß index
ipAdEntIfIndex (2)
ipAdEntNetMask (3)
ipAdEntBcastAddr (4)
ipAdEntReasmMaxSize (5)

A router in an unknown location of your network has, on a particular day, the following
entries in its IP address table:

ipAdEntAddr ipAdEntIfIndex ipAdEntNetMask ipAdEntBcastAddr ipAdEntReasmMaxSize
103.96.8.138 4 255.255.255.0 0 15000
123.45.2.1 1 255.255.255.0 0 12000
123.48.3.4 3 255.255.0.0 1 12000
165.8.9.25 2 255.255.255.0 0 10000

Answer the following questions (3 marks each):

(a) What is the object id (OID) of the third IP address of this router?

(b) If you do not know any of the IP addresses of the router, you cannot use a MIB
browser on your PC to determine the first IP addresses of the router – why?

(c) Now assume you know that the router has an interface with IP address 123.48.3.4.
Show the snmp operation (including parameters) that fetches you the network
mask (3rd column) corresponding to this IP address, along with the corresponding
response.

(d) Show how you can retrieve the entire row corresponding to the router’s IP address
123.48.3.4 using a single SNMP operation.

(e) Show how you can use the snmp-getnext operation (including parameters) that
fetches you the lexicographically last IP address of this router, and show the
corresponding response.