Network Engineer L1 L2 Interview Questions and Answers

VTP is configured by setting a domain name and mode. VPN is configured by setting up a tunnel between two endpoints.

• To configure VTP, set a domain name and mode on all switches in the same VTP domain.

• VTP modes include server, client, and transparent.

• To configure VPN, set up a tunnel between two endpoints using protocols such as IPSec or SSL.

• VPN tunnels can be used to securely connect remote offices or allow remote access for employees.

• VPN tunnels can also be used to bypass ge...read more

AAA, TACACS+, OSPF, and STP are networking protocols used for authentication, routing, and redundancy.

• AAA (Authentication, Authorization, and Accounting) is a security protocol used to control access to network resources.

• TACACS+ (Terminal Access Controller Access-Control System Plus) is a protocol used for authentication, authorization, and accounting.

• OSPF (Open Shortest Path First) is a routing protocol used to determine the best path for data to travel on a network.

• STP (Spa...read more

Internet may not be working due to various reasons such as network connectivity issues, DNS problems, or hardware failures.

• Check network cables and connections to ensure they are properly connected.

• Verify if the router or modem is functioning correctly.

• Troubleshoot DNS settings to ensure they are configured properly.

• Check for any software updates or firewall settings that may be blocking internet access.

• Contact the Internet Service Provider (ISP) to check for any service outa...read more

VLAN stands for Virtual Local Area Network, used to segment network traffic for security and performance purposes.

• VLANs divide a single physical network into multiple logical networks.

• They help in improving network security by isolating traffic between different VLANs.

• VLANs can also improve network performance by reducing broadcast traffic.

• They are configured at the switch level by assigning specific ports to a VLAN.

• Example: VLAN 10 for finance department, VLAN 20 for marketi...read more

Commands on Routing and Switching for WiFi

• For routing: show ip route, ip route, ip default-gateway, ip route-cache

• For switching: show mac address-table, show interfaces, show vlan, show spanning-tree

• For WiFi: show wireless, show dot11, show wlan, show ap summary

DNS server is a computer server that contains a database of public IP addresses and their associated hostnames.

• DNS servers translate domain names into IP addresses

• They help in resolving domain names to their corresponding IP addresses

• DNS servers store records like A, AAAA, CNAME, MX, etc.

• Examples of DNS servers include Google DNS, OpenDNS, and Cloudflare DNS

ARP is a protocol used to map an IP address to a MAC address. RARP is used to map a MAC address to an IP address.

• ARP stands for Address Resolution Protocol

• It is used to map a network address (such as an IP address) to a physical address (such as a MAC address)

• RARP stands for Reverse Address Resolution Protocol

• It is used to map a physical address (such as a MAC address) to a network address (such as an IP address)

• ARP and RARP are both used in computer networks to facilitate co...read more

A network is a collection of computers, servers, mainframes, network devices, and other devices connected to each other to share information and resources.

• Networks can be wired or wireless

• Networks can be local (LAN), wide area (WAN), or global (Internet)

• Examples of network devices include routers, switches, and firewalls