Networking

Question 1

What is the difference between a HUB, switch and router

Answer 1

Hub floods traffic (not smart)

switch sends traffic to destination based on MAC address.

Question 2

What are Lan, Wan, Can?

Answer 2

Local Area Network
Wide Area Network
Campus Area Network

Question 3

What a 4 network typologies?

Answer 3

Star, Ring, Bus, mixed.

Question 4

What is a mixed topology?

Answer 4

Large networks using more than one topology

Question 5

How can you increase traffic control within networks

Answer 5

Use multiple subnets

Question 6

What are the differences between a Vswitch and a Pswitch?

Answer 6

v Switches already know MAC addresses of connected VMs

p Switches are limited by the number of ports, cables plugged in, and include an uplink port

Question 7

How many bits in a IP address

Answer 7

32 bits, written as a 8 bit numbers 172.217.25.163

Question 8

What is an v switch abstraction layer?

Answer 8

Allows a pNIC to be shared by multiple VMs
Allows vSwitches to be distributed across multiple physical hosts
Allows traffic to be captured(for VM snapshots, live backups, etc.)
Allows traffic to be redirected(for VM/storage migration)
Allows traffic for one cloud consumer to be effectively isolated

Question 9

What is the problem with having many high speed NICs?

Answer 9

Each time data is received or successfully sent, the NIC will send an interrupt to the CPU for the operating system (hypervisor) causing reducing performance

Question 10

What are the 3 port types to isolate traffic in Private Clouds?

Answer 10

Promiscuous ports: communicate with all other ports in the VLAN

Isolated ports: only communicate with promiscuous ports

Community ports: only communicate with promiscuous ports and other ports in the same community

Question 11

What is SDN?

Answer 11

Software Defined Networking, aims to: move the control plane out of the physical device and into software