10+ Central Books Interview Questions and Answers

Routers operate at Layer 3 of the OSI model and make decisions based on IP addresses, while switches operate at Layer 2 and make decisions based on MAC addresses.

• Routers operate at Layer 3 of the OSI model, while switches operate at Layer 2.

• Routers make decisions based on IP addresses, while switches make decisions based on MAC addresses.

• Routers connect different networks together, while switches connect devices within the same network.

• Routers use routing tables to determine ...read more

OSPF DR and BDR are routers elected to manage communication within a multi-access network.

• DR stands for Designated Router and BDR stands for Backup Designated Router.

• They are elected by OSPF routers on a multi-access network to manage communication.

• DR and BDR are responsible for maintaining the topology database and forwarding updates to other routers.

• They reduce the amount of OSPF traffic on the network by acting as a central point of contact.

• If the DR fails, the BDR takes o...read more

A switch is a networking device that operates at Layer 2 of the OSI model, handling data at the data link layer.

• Switches forward data based on MAC addresses

• Operate at Layer 2 of the OSI model

• Used to create LANs and connect devices within a network

• Helps reduce network congestion by only sending data to the intended recipient

In the OSI model, each layer has specific functions and responsibilities in the communication process.

• The OSI model consists of 7 layers, each with its own specific functions and responsibilities.

• Each layer communicates with the adjacent layers to ensure data is properly transmitted.

• For example, in the OSI model, Layer 1 (Physical layer) deals with the physical connection between devices, while Layer 2 (Data Link layer) handles data framing and error detection.

EIGRP Authentication is a security feature that ensures only authorized routers can participate in EIGRP routing.

• EIGRP Authentication uses a shared secret key between routers to authenticate each other.

• It can be configured in two modes - MD5 authentication and SHA authentication.

• MD5 authentication is more commonly used and provides better security.

• SHA authentication is newer and provides stronger security.

• EIGRP Authentication can prevent unauthorized routers from participatin...read more

VLAN stands for Virtual Local Area Network. It is a logical grouping of devices on a network based on their function, project or application.

• VLANs allow network administrators to segment a network into smaller, more manageable groups.

• Devices in a VLAN can communicate with each other as if they were on the same physical network, even if they are physically located on different switches.

• VLANs can improve network security by isolating sensitive data and restricting access to it....read more

OSI works on the network layer.

• OSI (Open Systems Interconnection) model works on the network layer, which is Layer 3.

• The network layer is responsible for routing packets from the source to the destination across multiple networks.

• Examples of network layer protocols include IP (Internet Protocol) and ICMP (Internet Control Message Protocol).

DNS stands for Domain Name System, which translates domain names to IP addresses.

• DNS is like a phone book for the internet, translating human-readable domain names (like google.com) into IP addresses (like 172.217.3.206).

• It helps users access websites by translating domain names into IP addresses that computers can understand.

• DNS also helps with email delivery by translating domain names into IP addresses for mail servers.

• DNS operates through a distributed network of servers ...read more

SDN stands for Software-Defined Networking, a technology that allows network administrators to manage network services through abstraction of lower-level functionality.

• SDN separates the control plane from the data plane, allowing for centralized control of network traffic.

• It enables network programmability, automation, and flexibility.

• SDN can improve network performance, security, and scalability.

• Examples of SDN technologies include OpenFlow, Cisco ACI, and VMware NSX.