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Network Support Engineer Interview Questions

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How to packets travel across a switched network? What is the purpose of vlan tagging? What is contained in a DHCP packets?

2 Answers

Switch uses frames. Vlan tagging is used to tag frame packets across trunk links. DORA

The simple answer would be they use frames to travel through the network. The complex answer would be since L 2 uses mac address to communicate with each other a source and destination MAC address is read from the frame and switch looks up the destination mac address in the MAC table if the MAC address is within switch table it will send the frame to the destination. If not then it will broadcast ( ARP ) to each port except the one from where the frame originated from and discover the MAC address that way. VLAN tagging is used to determine which interface to send the packet to. VLAN tagging is a process which can add the information of the VLAN in the packet header so in case a there is a disruption in the network the packet won't lose the information on which VLAN to send the packet to. It is basically used in a large network with proxy's involved. How DHCP work. D - Discover. O - Offer - R- Request. A - Acknowledge. A client sends a Discover packet to via DHCP services. DHCP server receives the discover packet look at its pool and Offer a DHCP message with IPv4 address in it. Client accepts the offer received from the DHCP server. DHCP server acknowledges the request and sends IPv4 address on the way to the client.

Why PC1 is not gretting an IP address from the DHCP server.

2 Answers

TCP handshake what is it how does it work

1 Answer

layer 1 & 2 troubleshooting

1 Answer

Very basics of DHCP (how does it work)

1 Answer

what is STP, DHCP, DNS, OSI . what do you know about wireless technology? They were all just simple questions as i am in the networking field.

1 Answer

DHCP, STP, Wireless, DORA process in DHCP. differennce between 2.4 and 5 Ghz. What is NAT SSL certificate what is IPsec and what tunnels does it have what is vlan osi layer

1 Answer

Communication between two computers using a cable and determining if packet will be received by the other machine.

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Presentation followed by "Think of a time when..."

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