1. Bus Topology
Q1: In a bus topology, if 10 devices are connected to a single backbone cable, how many ports are required at the devices?
a) 1
b) 10
c) 2
d) 5
Answer: a) 1
Explanation: Each device in a bus topology has 1 port connecting it to the backbone cable.
2. Star Topology
Q2: If a star topology has 7 devices connected to a central hub, how many ports does the central hub need?
a) 7
b) 6
c) 5
d) 8
Answer: a) 7
Explanation: The central hub will have one port for each connected device. If there are 7 devices, the hub requires 7 ports.
3. Ring Topology
Q3: In a ring topology with 5 devices, how many ports are required for each device?
a) 2
b) 1
c) 5
d) 3
Answer: a) 2
Explanation: In a ring topology, each device requires 2 ports (one for input and one for output), forming the ring.
4. Mesh Topology
Q4: In a full mesh topology with 6 devices, how many connections (links) are required between the devices?
a) 6
b) 12
c) 15
d) 30
Answer: c) 15
Explanation: In a full mesh topology, the number of connections (links) is calculated using the formula:Number of links=n(n−1)2\text{Number of links} = \frac{n(n-1)}{2}Number of links=2n(n−1)
For 6 devices, 6(6−1)2=15\frac{6(6-1)}{2} = 1526(6−1)=15 links.
5. Tree Topology
Q5: In a tree topology with 4 devices connected in 2 levels (1 root node and 3 branch nodes), how many ports are required at the root node?
a) 1
b) 3
c) 4
d) 5
Answer: b) 3
Explanation: The root node connects to 3 branch nodes. Therefore, the root node requires 3 ports.
6. Hybrid Topology
Q6: In a hybrid topology consisting of 2 star topologies connected through a bus backbone, if there are 4 devices in each star network, how many total ports are required?
a) 10
b) 8
c) 12
d) 14
Answer: c) 12
Explanation: Each star has 4 devices, so each star has 4 ports. Since there are 2 stars, we have 4×2=84 \times 2 = 84×2=8 ports. The bus backbone connects the two stars, requiring 1 port at each star, so an additional 2 ports are needed for the bus. Therefore, the total number of ports is 8+2=128 + 2 = 128+2=12.
7. Bus Topology with Termination
Q7: In a bus topology with 12 devices, how many terminators are needed at the ends of the bus cable?
a) 1
b) 2
c) 12
d) 0
Answer: b) 2
Explanation: A bus topology requires one terminator at each end of the backbone cable to prevent signal reflection. Hence, 2 terminators are needed.
8. Star Topology Expansion
Q8: If a star topology has 5 devices and you add 3 more devices, how many new ports are needed on the central hub?
a) 5
b) 8
c) 3
d) 6
Answer: c) 3
Explanation: When 3 new devices are added, 3 new ports are needed on the central hub. Therefore, 3 additional ports are required.
9. Ring Topology Failure
Q9: In a ring topology with 8 devices, if one device fails, how many devices are affected in a single-ring network?
a) 1
b) 2
c) 8
d) All devices
Answer: b) 2
Explanation: In a single-ring topology, if one device fails, it can disrupt the network for 2 devices (the one failing and the one directly connected to it). The failure may stop data from circulating through the ring.
10. Mesh Topology Port Calculation
Q10: How many ports are required on each device in a mesh topology if there are 4 devices?
a) 1
b) 2
c) 3
d) 4
Answer: c) 3
Explanation: In a full mesh topology, each device needs to connect to all other devices. For 4 devices, each device requires 3 ports (one for each of the 3 other devices).
11. Tree Topology Link Calculation
Q11: In a tree topology with 3 levels (1 root node, 2 intermediate nodes, and 4 leaf nodes), how many links are required to connect all devices?
a) 6
b) 7
c) 8
d) 9
Answer: b) 7
Explanation: The root node has links to 2 intermediate nodes (2 links). Each intermediate node has links to 2 leaf nodes (4 links). Therefore, the total number of links is 2+4=72 + 4 = 72+4=7.
12. Hybrid Topology Expansion
Q12: In a hybrid topology that consists of a star and bus combination, if the bus backbone has 2 devices connected to it and 4 stars with 3 devices in each, how many total devices are there in the network?
a) 8
b) 12
c) 14
d) 16
Answer: c) 14
Explanation: The bus backbone has 2 devices, and each star network has 3 devices, with 4 star networks. Therefore, the total number of devices is 2+(4×3)=142 + (4 \times 3) = 142+(4×3)=14.
13. Mesh Topology Device Calculation
Q13: If a full mesh topology has 10 devices, how many links are needed to connect all devices?
a) 45
b) 55
c) 90
d) 100
Answer: b) 45
Explanation: In a full mesh, the number of links can be calculated as:n(n−1)2=10(10−1)2=45\frac{n(n-1)}{2} = \frac{10(10-1)}{2} = 452n(n−1)=210(10−1)=45
14. Bus Topology Cable Length
Q14: In a bus topology, if the distance between two devices is 100 meters and the network has 5 devices, what would be the total length of the bus cable required (excluding device connections)?
a) 100 meters
b) 200 meters
c) 400 meters
d) 500 meters
Answer: b) 200 meters
Explanation: The cable length required would be the distance between the two furthest devices. If the distance between two devices is 100 meters, the total cable length would be approximately 100×2=200100 \times 2 = 200100×2=200 meters.
