10+ 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

Aspiring Network Engineer with hands-on experience in L1 and L2 support, eager to enhance network performance and reliability.

• Educational background in Computer Science or Networking.

• Experience with troubleshooting network issues, e.g., resolving connectivity problems.

• Familiarity with network protocols like TCP/IP, DNS, and DHCP.

• Hands-on experience with network devices such as routers and switches.

• Certifications like CompTIA Network+ or Cisco CCNA to validate skills.

SNMP tool is a protocol used to monitor and manage network devices remotely.

• SNMP stands for Simple Network Management Protocol

• It allows network administrators to manage network performance, find and solve network problems, and plan for network growth

• SNMP tools can be used to monitor network devices such as routers, switches, servers, printers, and more

• Examples of SNMP tools include SolarWinds, Nagios, and PRTG

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

L2 devices operate at the data link layer and L3 devices operate at the network layer.

• L2 devices include switches, bridges, and VLANs.

• L3 devices include routers, layer 3 switches, and firewalls.

• L2 devices forward frames based on MAC addresses.

• L3 devices forward packets based on IP addresses and use routing protocols.

• L2 devices are used to segment networks and reduce collisions.

• L3 devices are used to connect different networks and route traffic between them.

Basic router configuration commands set up and manage network devices effectively.

• Enter privileged EXEC mode: 'enable'

• Enter global configuration mode: 'configure terminal'

• Set the hostname: 'hostname Router1'

• Configure an interface: 'interface GigabitEthernet0/0'

• Assign an IP address: 'ip address 192.168.1.1 255.255.255.0'

• Enable the interface: 'no shutdown'

• Set a password for console access: 'line con 0' followed by 'password yourpassword' and 'login'

• Save the configuration: 'writ...read more

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

Service Requests (SR) should be resolved within the agreed Service Level Agreement (SLA) timeframe to ensure customer satisfaction.

• Understand the SLA: Know the specific timeframes for different types of service requests.

• Prioritize Requests: Triage SRs based on urgency and impact on business operations.

• Effective Communication: Keep stakeholders informed about the status of their requests.

• Documentation: Maintain clear records of actions taken to resolve SRs for future reference...read more