Walk-in || Network Engineer

Designation: Engineer Networking

Role: L1 Engineer

Location: Chennai (Ambit IT Park)

Shifts: Flexible to work in Night Shifts

Job Responsibility:

• Troubleshoot/Diagnose all Level 1 issues from the customers and driving satisfactory resolution of the issues.
• Troubleshoot Product, Codes and Configuration issues
• Ensure consistent customer satisfaction
• Document all communication with customers in the CRM
• Interface with international customers (via Phone Support)
• Timely handoff (escalation) of cases that require technical or political to L2 TAC

Primary Skills:

• OSI layers detailed understanding of each layer’s function and relevant protocols that operates at each level
• TCP/IP – thorough understanding and clear explanation about windowing/handshake mechanism
• MAC header structure and use of each fields
• IP header structure and use of each fields
• ARP – how ARP works in a Layer 2 and Layer 3 communication
• Mac address table fields and how a switch uses MAC table for switching decisions
• ARP table and how a switch uses ARP table
• Routing Table fields and how a Router uses routing table for routing decisions
• DHCP protocol messages (clear understanding of DORA process)
• DHCP operation in layer 2 and layer 3 scenarios (server & client in same vlan or different VLAN)
• thorough understanding of Broadcast domain and Collision Domain
• thorough understanding of Unicast, Multicast and Broadcast traffic
• thorough understanding of Subnetting, Vlan, VTP, 802.1q, STP, Linkage
• thorough understanding of RIP (version 1 and 2) and OSPF (link states, LSA types, area types, router types, neighbor communication)
• Difference between Routing and Routed protocols
• Good troubleshooting approach (from Level 1 to 7 of OSI)

Look into Wireshark capture
1:ARP learning process and it’s flavour
2:How switch learns the mac address
3: DHCP server and Client communication in same network and different network
4:OSI headers
Protocol and port number working
OSI layer model and its learning of encapsulation and decapsulation
5: IP Addressing and Subnetting
6: Difference between layer two and three switch
7: DHCP, Switching and Routing with OSI headers
STP
Vlan
Trunk and Access port

how switch learns the mac address
How ARP learns the mac address in same subnet and different subnet
Difference between hub,layer2 switch and layer 3 switch and router
DHCP DORA process sender IP,mac and port number and destination IP,mac and port number
OSI: how to troubleshoot in network with help of OSI model.
Data link header
Ip header
TCP header