ICT OFFICER II - NETWORK ADMIN WRITTEN INTERVIEW MOCK.
QUESTIONS:
Question 1
Which of the following is NOT a function of the network layer in the OSI model?
A. Routing
B. Error control
C. Congestion control
D. Inter-networking
Question 2
A grocer's sales for five months are Tzs 6435, Tzs 6927, Tzs 6855, Tzs 7230 and Tzs 6562. What sale in the sixth month gives an average sale of Tzs 6500?
A. Tzs 5991
B. Tzs 6001
C. Tzs 6991
D. Tzs 4991
Question 3
How many usable host addresses does a /26 IPv4 subnet provide?
A. 62
B. 64
C. 126
D. 30
.
Question 4
A fruit seller had some apples. He sells 40% of them and still has 420 apples. How many apples did he have originally?
A. 588
B. 600
C. 700
D. 672
Question 5
What is the main purpose of DHCP snooping configured on a LAN switch?
A. It encrypts all DHCP messages between client and server
B. It blocks unauthorized (rogue) DHCP servers from offering addresses to clients
C. It assigns static addresses to trusted switch ports
D. It shortens the lease renewal time
Question 6
A can do a work in 15 days and B in 20 days. If they work together for 4 days, what fraction of the work is left?
A. 8/15
B. 7/15
C. 1/4
D. 1/10
Question 7
The IEEE 802.1Q standard is used for which of the following?
A. Link aggregation
B. Spanning tree protocol
C. Port-based authentication
D. VLAN tagging on trunk links
.
Question 8
Alfred buys an old scooter for Tzs 4700 and spends Tzs 800 on repairs. He sells it for Tzs 5800. What is his gain percent?
A. 4 4/7%
B. 10%
C. 5 5/11%
D. 12%
Question 9
When discussing IDS/IPS, what is a signature?
A. The normal baseline traffic profile of the network
B. An attack-definition pattern used to recognise known malicious activity
C. An electronic signature that authenticates a user
D. A list of users authorised to use the network
Question 10
The present ages of Sameer and Anand are in the ratio 5 : 4. Three years hence the ratio will be 11 :
9. What is Anand's present age?
A. 24
B. 27
C. 40
D. 20
Question 11
Which measure best mitigates a TCP SYN flood attack against a public web server?
A. Disable TCP entirely
B. Increase the ARP cache size
C. Create more VLANs
D. Enable SYN cookies and limit half-open connections
.
Question 12
Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?
A. 7
B. 12
C. 10
D. 13
Question 13
Two IPv6 hosts communicate and the packet must cross a region that supports only IPv4. Which strategy is used?
A. Tunneling
B. Dual stack
C. Header translation
D. Static routing
Question 14
The average weight of 8 persons increases by 2.5 kg when a new person replaces one of them weighing 65 kg. What is the weight of the new person?
A. 76 kg
B. 85 kg
C. 76.5 kg
D. 90 kg
Question 15
What is the broadcast address of the host 192.168.5.77/26?
A. 192.168.5.64
B. 192.168.5.126
C. 192.168.5.127
D. 192.168.5.255
.
Question 16
The cost price of 20 articles equals the selling price of x articles. If the profit is 25%, what is x?
A. 15
B. 18
C. 25
D. 16
Question 17
Which Windows command shows the routers a packet passes through to reach its destination?
A. ipconfig
B. tracert
C. netstat
D. nslookup
Question 18
Tzs 981 is divided between two people in the ratio 5 : 4. What is the larger share?
A. Tzs 545
B. Tzs 436
C. Tzs 500
D. Tzs 589
Question 19
Which default UDP port does the Network Time Protocol (NTP) use?
A. 53
B. 69
C. 123
D. 161
.
Question 20
A's age after 15 years will be 5 times his age 5 years ago. What will his age be 3 years from now?
A. 11
B. 12
C. 15
D. 13
Question 21
What does a DHCP server include in a DHCP offer to a client?
A. The offered IP address, subnet mask, lease time and the DHCP server address
B. Only the client MAC address and hostname
C. Only the default gateway
D. Only the DNS server list
Question 22
A is two years older than B, who is twice as old as C. If the total of their ages is 27, how old is B?
A. 8
B. 10
C. 9
D. 12
Question 23
Which switch feature best defends a VLAN against ARP poisoning (spoofing)?
A. Port mirroring
B. DHCP relay
C. Storm control only
D. Dynamic ARP Inspection using DHCP snooping bindings
.
Question 24
A alone can finish a job in 6 days and B alone in 8 days. They agree to do it for Tzs 3200. With C's help they finish in 3 days. How much is C paid?
A. Tzs 375
B. Tzs 800
C. Tzs 400
D. Tzs 600
Question 25
Which OSI layer provides process-to-process delivery using port numbers?
A. Transport layer
B. Network layer
C. Data link layer
D. Session layer
Question 26
The captain of an 11-member team is 26 years old and the wicket keeper is 3 years older. Excluding these two, the average age of the others is one year less than the team average. What is the team's average age?
A. 22 years
B. 23 years
C. 24 years
D. 25 years
Question 27
Which default UDP port is used by the syslog protocol for log forwarding?
A. 123
B. 161
C. 514
D. 25
.
Question 28
Two students appeared at an examination. One secured 9 marks more than the other, and his marks were 56% of the sum of their marks. What marks did they obtain?
A. 39 and 30
B. 41 and 32
C. 43 and 34
D. 42 and 33
Question 29
A link using time division multiplexing carries 8000 frames per second and each slot has 8 bits. What is the transmission rate of the circuit?
A. 8 kbps
B. 64 kbps
C. 64 bps
D. 1 Mbps
Question 30
A vendor bought toffees at 6 for a rupee. How many toffees must he sell for a rupee to gain 20%?
A. 5
B. 3
C. 4
D. 6
Question 31
Users in one VLAN suddenly cannot reach the internet but can still reach local servers. What is the best first course of action?
A. Reboot every switch repeatedly until the problem disappears
B. Disable logging to reduce noise and wait for a ticket
C. Check the VLAN default gateway, routing and ACLs, review logs, then fix and document the fault
D. Postpone investigation until the next maintenance window
.
Question 32
What is the simple interest on Rs 8000 at 5% per annum for 3 years?
A. Tzs 800
B. Tzs 1000
C. Tzs 1500
D. Tzs 1200
.
Question 33
Which attack tries to render a computer resource unavailable to its intended users?
A. Denial-of-service attack
B. Worm infection
C. Phishing
D. Cookie theft
Question 34
Which IPv6 prefix identifies link-local unicast addresses?
A. 2001:db8::/32
B. ::1/128
C. fe80::/10
D. fc00::/7
.
Question 35
To decide whether to use IPv4 or IPv6 when sending to a dual-stack destination, the source host queries which of the following?
A. The transport layer
B. The DNS server
C. The packet header
D. The default gateway
Question 36
Find the next number in the series: 2, 5, 11, 23, ...
A. 35
B. 46
C. 45
D. 47
.
Question 37
Which Linux command lists listening TCP sockets with numeric port numbers?
A. ss -tln
B. ip route show
C. dig +short
D. arp -a
.
Question 38
A client receives DHCP offers from several DHCP servers. What does it do next?
A. Sends a unicast release to the first server
B. Ignores all offers and keeps its old address
C. Broadcasts a DHCP request naming the server whose offer it accepts
D. Sends a DHCP release to every server
Question 39
How does a DNS amplification DDoS attack work?
A. It fills the switch MAC table with random addresses
B. Small spoofed queries to open resolvers trigger large responses sent to the victim
C. It poisons the ARP cache of the gateway
D. It injects SQL into the DNS server
.
Question 40
In generative AI, what does the term hallucination mean?
A. The model refuses to answer any question
B. The model slows down under heavy load
C. The model encrypts its own output
D. The model produces confident but false or fabricated content
.
Question 41
Which Windows utility combines the functions of ping and tracert and reports packet loss per hop?
A. pathping
B. nslookup
C. arp
D. route print
Question 42
What type of routing protocol is OSPF?
A. Distance-vector
B. Path-vector
C. Link-state
D. Static
.
Question 43
What is the combination of an IP address and a port number called?
A. MAC address
B. Port mask
C. Subnet gateway
D. Socket address
Question 44
On which default UDP port do SNMP agents listen for queries from a network management station?
A. 123
B. 161
C. 514
D. 69
.
Question 45
Which OSI layer encapsulates network-layer packets into frames for transmission?
A. Data link layer
B. Transport layer
C. Physical layer
D. Application layer
Question 46
What is the main purpose of the Spanning Tree Protocol (STP)?
A. Encrypt trunk traffic
B. Prevent switching loops in redundant topologies
C. Assign IP addresses to hosts
D. Aggregate several links into one
.
Question 47
Two hosts are connected NIC to NIC with a straight-through cable and pings fail although both IPs are in the same subnet. What is the likely fix?
A. Set the subnet mask to 0.0.0.0
B. Install a DNS server
C. Use a crossover cable (or ports with auto-MDIX)
D. Enable DHCP snooping
Question 48
Which Linux command queries DNS servers for records such as A, MX and PTR?
A. ss
B. ip addr
C. traceroute
D. dig
.
Question 49
How does NAT overload (PAT) let many private hosts share one public IP address?
A. By translating each flow using a unique source port number
B. By giving every host the same MAC address
C. By tunnelling all traffic through a VLAN
D. By assigning one DHCP lease to all hosts
.
Question 50
Which UDP ports do a DHCP server and a DHCP client use?
A. 53 and 123
B. 161 and 162
C. 67 (server) and 68 (client)
D. 80 and 443
.
Answer Key
No. | Answer |
1 | B |
2 | D |
3 | A |
4 | C |
5 | B |
6 | A |
7 | D |
8 | C |
9 | B |
10 | A |
11 | D |
12 | C |
13 | A |
14 | B |
15 | C |
16 | D |
17 | B |
18 | A |
19 | C |
20 | D |
21 | A |
22 | B |
23 | D |
24 | C |
25 | A |
26 | B |
27 | C |
28 | D |
29 | B |
30 | A |
31 | C |
32 | D |
33 | A |
34 | C |
35 | B |
36 | D |
37 | A |
38 | C |
39 | B |
40 | D |
41 | A |
42 | C |
43 | D |
44 | B |
45 | A |
46 | B |
47 | C |
48 | D |
49 | A |
50 | C |
NB: "ANYTHING CAN HAPPEN"
