Chapter 2: Interview Questions& Answers Part 2
Q.51 What is the primary function of a router in a network?
Answer: A router is a network device that forwards data packets between different networks. It operates at the network layer (Layer 3) of the OSI model and uses routing tables to determine the best path for data transmission.
Q.52 Explain the difference between a router and a switch.
Answer: A router connects different networks and makes decisions based on logical addressing (IP addresses). A switch operates within a single network and uses MAC addresses to forward frames within that network.
Q.53What is the purpose of a default gateway on a router?
Answer: The default gateway on a router is the IP address used when a device needs to communicate with a device on another network. It serves as the entry and exit point for traffic leaving or entering a network.
Q.54How does NAT (Network Address Translation) work on a router?
Answer: NAT allows multiple devices in a private network to share a single public IP address when accessing the internet. It translates private IP addresses to a single public IP, enhancing security and conserving public IP addresses.
Q.55What is the significance of the router's configuration mode?
Answer: Configuration mode on a router allows network administrators to make changes to the router's settings. It is where commands are entered to define interfaces, set IP addresses, configure routing protocols, and more.
Q.56Explain the purpose of static routing and dynamic routing on a router.
Answer: Static routing involves manually configuring routes on a router, specifying the path that data should take. Dynamic routing uses routing protocols like RIP, OSPF, or EIGRP to automatically update and share routing information between routers.
Q.57How do you secure access to a router's command-line interface (CLI)?
Answer: Access to a router's CLI can be secured using methods like setting passwords, enabling SSH (Secure Shell), and configuring access control lists (ACLs) to restrict who can access the router remotely.
Q.58Describe the process of configuring an IP address on a router interface.
Answer: To configure an IP address on a router interface, you enter the router's configuration mode, navigate to the interface, and use the"ip address" command followed by the desired IP address and subnet mask.
Q.59What is the purpose of router interfaces?
Answer: Router interfaces connect the router to different networks. Each interface typically corresponds to a specific network segment and is configured with an IP address to facilitate communication within that network.
Q.60How does a router determine the best path for data transmission?
Answer: A router uses routing tables to determine the best path for data transmission. These tables contain information about known networks and the associated next-hop routers, allowing the router to make informed forwarding decisions.
Q.61 What is the purpose of a VLAN (Virtual Local Area Network)?
Answer: VLANs are used to logically segment a network into smaller broadcast domains, improving network efficiency, security, and manageability. They group devices regardless of their physical location into broadcast domains.
Q.62 Explain the difference between a hub, a switch, and a router in a network.
Answer: A hub operates at the physical layer and broadcasts data to all connected devices. A switch operates at the data link layer, filtering and forwarding frames based on MAC addresses. A router operates at the network layer, making forwarding decisions based on IP addresses.
Q.63 What is STP (Spanning Tree Protocol) and why is it important in switched networks?
Answer: STP is a protocol that prevents loops in Ethernet networks by identifying redundant paths and blocking them. It ensures a loo
