Unit 3: Network Services
Networking · Unit 3 · Paper 1

Network Services unit test

A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.

Paper 1Paper 2Paper 3
Each paper is built from this unit’s 40 terms and is the same for everyone, so a teacher can assign “Unit 3, Paper 1” and every student sits the identical test. Multiple choice is marked objectively; the written sections you mark yourself against the model answer and rubric.
Suggested time 33 min 30 points0/17 attempted
1

Service dependency

2

PTR record

3

NTP

4

DHCP lease

5

Syslog

6

A and AAAA records

7

Well-known ports 20 and 21

8

Well-known ports 22, 23, 25

9

DNS

10

SSH

11

DHCP relay

12

FTP, SFTP and FTPS

Short answer 1. Define or explain: LDAP and directory services

3 pts

Short answer 2. Define or explain: HTTP and HTTPS

3 pts

Short answer 3. Define or explain: Authoritative vs recursive DNS server

3 pts

Short answer 4. Define or explain: Web server vs application server

3 pts

Free response

6 pts

A student types a web address into a browser on a laptop that has just joined a campus Wi-Fi network, and a page loads. (a) Describe what DHCP does for the laptop when it joins, and name two pieces of configuration it receives beyond its own IP address. (b) Describe how the domain name is resolved to an IP address, including what happens when the local resolver has no cached answer. (c) Explain encapsulation by describing what is added to the data as it moves down the sending host's stack. (d) The page fails to load but the student can reach a site by typing its IP address directly. State what this isolates as the likely fault and explain your reasoning.