Dimension Data Senior Network Engineer Interview Questions and Answers

Switching and routing are fundamental concepts in networking.

• Switching is the process of forwarding data packets between devices on the same network.

• Routing is the process of forwarding data packets between different networks.

• Switches operate at layer 2 of the OSI model, while routers operate at layer 3.

• Examples of switching protocols include Ethernet and VLANs, while examples of routing protocols include OSPF and BGP.

The IP phone boot up process involves several steps to initialize the device and connect to the network.

• The phone powers on and performs a self-test

• It obtains an IP address from the DHCP server

• It downloads the firmware and configuration files from the TFTP server

• It registers with the call manager or PBX

• It is ready to make and receive calls

SIP call flow is the process of establishing, maintaining, and terminating a session initiated by Session Initiation Protocol (SIP).

• SIP INVITE message is sent from the caller to the callee

• Callee responds with a SIP 100 Trying message

• Callee sends a SIP 180 Ringing message to indicate the phone is ringing

• Callee sends a SIP 200 OK message to indicate the call is accepted

• Media negotiation takes place between the caller and...read more

Recently faced critical issue was network outage due to hardware failure.

• Hardware failure caused network outage

• Affected multiple departments and caused significant downtime

• Quickly identified and replaced faulty hardware to restore network

• Implemented redundancy measures to prevent future outages

A ticket can be managed by following a systematic approach.

• Acknowledge the ticket and assign it to the appropriate team member

• Set a priority level based on the severity of the issue

• Communicate with the customer and provide regular updates

• Resolve the issue and close the ticket

• Document the entire process for future reference

ARP stands for Address Resolution Protocol. It is used to map IP addresses to MAC addresses on a local network.

• ARP is used to find the MAC address of a device based on its IP address.

• It works by broadcasting an ARP request packet on the local network asking for the MAC address associated with a specific IP address.

• The device with the matching IP address responds with its MAC address, allowing communication to occur.

• ARP...read more

OSI layers are a conceptual framework that standardizes the functions of a telecommunication or computing system into seven abstraction layers.

• Physical layer - transmits raw data bits over a physical medium

• Data link layer - provides error detection and correction

• Network layer - routes data packets to their destination

• Transport layer - ensures reliable data transfer

• Session layer - establishes, maintains, and terminates ...read more