ICC Network Fundamentals 2 — Questions and Answers
Question 1: Which OSI layer is responsible for logical addressing and routing packets between networks?
- Data Link
- Network (Correct answer)
- Transport
- Session
Correct answer: Network
The Network layer (Layer 3) handles logical addressing via IP and determines the best path for packet delivery across interconnected networks.
Question 2: What is the default subnet mask for a Class B IP address?
- 255.0.0.0
- 255.255.0.0 (Correct answer)
- 255.255.255.0
- 255.255.255.128
Correct answer: 255.255.0.0
Class B addresses use a default subnet mask of 255.255.0.0, providing 16 bits for the host portion of the address.
Question 3: Which protocol dynamically assigns IP addresses to devices on a network?
- DNS
- ARP
- DHCP (Correct answer)
- SNMP
Correct answer: DHCP
DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses, subnet masks, default gateways, and DNS server addresses to network clients.
Question 4: In a star topology, if the central switch fails, what is the impact on the network?
- Only one segment fails
- Half the network fails
- All connected devices lose connectivity (Correct answer)
- The network reroutes automatically
Correct answer: All connected devices lose connectivity
In a star topology, all devices connect to a central switch, so failure of that switch results in complete loss of connectivity for all attached devices.
Question 5: What does the acronym VLAN stand for in network terminology?
- Virtual Local Area Network (Correct answer)
- Variable Length Access Node
- Verified LAN Architecture
- Virtual Link Access Network
Correct answer: Virtual Local Area Network
VLAN stands for Virtual Local Area Network, a logical segmentation of a physical network that groups devices regardless of their physical location.
Question 6: Which cable category is rated for 10 Gigabit Ethernet up to 100 meters?
- Cat 5
- Cat 5e
- Cat 6
- Cat 6A (Correct answer)
Correct answer: Cat 6A
Cat 6A (Augmented Category 6) supports 10 Gigabit Ethernet at frequencies up to 500 MHz over distances up to 100 meters.
Question 7: What is the maximum segment length for 100BASE-TX Fast Ethernet over twisted-pair cable?
- 50 meters
- 100 meters (Correct answer)
- 185 meters
- 500 meters
Correct answer: 100 meters
100BASE-TX Fast Ethernet has a maximum segment length of 100 meters when using Category 5 or better UTP cable.
ICC Network Fundamentals 2
Which OSI layer is responsible for logical addressing and routing packets between networks?