Aruba Associate Networking Fundamentals 1 — Questions and Answers
Question 1: What is the primary purpose of a router in a network?
- Control access to websites
- Provide IP addresses to clients
- Route traffic between different networks (Correct answer)
- Generate wireless signals
Correct answer: Route traffic between different networks
A router is a network device that operates at Layer 3 (Network Layer) of the OSI model. Its primary function is to forward data packets between different computer networks, such as a local area network (LAN) and the internet. Routers use IP addresses to determine the best path for data to travel, enabling communication across diverse network segments and the global internet.
Question 2: Which device is responsible for segmenting a network into separate collision domains?
- Router
- Firewall
- Switch (Correct answer)
- Repeater
Correct answer: Switch
A network switch operates at Layer 2 (Data Link Layer) of the OSI model and is designed to segment a network into separate collision domains. Unlike hubs, which broadcast data to all connected devices, a switch forwards data only to the intended recipient's port. This intelligent forwarding significantly reduces collisions and improves network performance by creating dedicated communication paths for each connected device.
Question 3: Which layer of the OSI model is responsible for end-to-end communication?
- Network
- Transport (Correct answer)
- Data Link
- Application
Correct answer: Transport
The Transport Layer (Layer 4) of the OSI model is responsible for end-to-end communication between applications on different hosts. It ensures reliable data transfer through services like segmentation, reassembly, error checking, and flow control. Protocols like TCP and UDP operate at this layer to manage the delivery of data from a source application to a destination application, guaranteeing data integrity and order.
Question 4: What is a characteristic of a MAC address?
- Assigned by DHCP
- Identifies logical network
- Assigned by the manufacturer (Correct answer)
- Changes every session
Correct answer: Assigned by the manufacturer
A MAC (Media Access Control) address is a unique hardware identifier assigned to a network interface controller (NIC) by its manufacturer. This physical address is burned into the device's firmware and is used at the Data Link Layer (Layer 2) of the OSI model to uniquely identify a device within a local network segment. Unlike IP addresses, MAC addresses are generally permanent and do not change, serving as a device's unique hardware fingerprint.
Question 5: Which IP address class provides the most host addresses?
- Class C
- Class B
- Class A (Correct answer)
- Class D
Correct answer: Class A
Class A IP addresses are designed for very large networks, allocating 8 bits for the network portion and 24 bits for the host portion. This configuration allows for approximately 16 million unique host addresses per network. This significantly larger host address space, compared to Class B or Class C, makes Class A the class that provides the most host addresses.
Question 6: Which protocol is used to assign IP addresses automatically?
- DNS
- FTP
- DHCP (Correct answer)
- NAT
Correct answer: DHCP
DHCP (Dynamic Host Configuration Protocol) is a network protocol specifically designed to automatically assign IP addresses and other network configuration parameters to devices. This automation simplifies network administration by eliminating the need for manual IP configuration for each device. Other protocols like DNS, FTP, and NAT serve different network functions.
Aruba Associate Networking Fundamentals 1
What is the primary purpose of a router in a network?