Checklists

Check your educational progress with the following checklists

Note: similar questions can be found in interview questions page with answers

Network Newbie

• OSI model

  • What layers the OSI model has and what is the purpose of each one of them?

• Ethernet

  • What is CSMA/CD and how it works?

• MAC address

  • What is it used for? Is it unique?
  • How many bits are in a MAC address?

• IP address

  • What is it used for? Is it unique worldwide?
  • What are the two parts of an IP address?
  • How many bits are in an IP address?

• Subnets

  • Two hosts are on the same subnet if they have the same '_____'
  • What is a netmask?
  • What two syntaxes exist for expressing a netmask?

• ARP

  • Which layer of the OSI model do ARP belong to?
  • What ARP table includes?
  • Give an example of how ARP protocol works

• IP

  • What it defines?
  • What is a routing table? When is it being used?

• TCP

  • What are the differences between TCP and UDP? When would you prefer to use TCP over UDP?
  • What is a "three-way handshake"?

• UDP

  • Why UDP considered to be unreliable when compared to TCP?
  • Which layer of the OSI model do UDP belong to?

• DHCP

  • How DHCP client locates the DHCP server?
  • Does the client has to be on the same local network as the server?
  • How the exchange between client and the server looks like? what steps are included?
  • Is it using TCP or UDP?
  • What ports is it using?

• Netowrk Devices

  • What is a HUB?
  • What is a Switch?
    • Forwarding table or (aka forwarding information base)
  • What is a Router?
  • What are differences between the three devices above?

• Delivery schemes

  • What is unicast?
  • What is multicast?
  • What is broadcast?
    • What is the broadcast address?
    • What protocols use broadcast?
    • What is a broadcast domain?

• VLAN

  • What are the advantages of using VLAN?
  • What is the range for VLAN IDs?
  • What is a trunk port?

• Topologies

  • Bus topology
  • Ring topology
  • Star topology
  • Tree topology

• IP

  • What layer of OSP model it belongs to?
  • IPv4
  • IPv6
    • Why IPv6 is needed if IPv4 exists?

• ICMP

  • What is it used for?
  • How do you use it?

• NAT

  • What is it and why it's needed?
  • What is SNAT? how it is different from NAT?
  • What is DNAT? how it is different from SNAT?

Intermediate

• Routing

  • Distance Vector Routing
    • "Count-to-infinity" problem
  • Dijkstra's algorithm

• TCP

  • Silly window syndrome
    • Nagle's algorithm
    • Clark's solution

Linux Networking

• Commands

  • ping
  • ip addr
  • ip neigh
  • ip link
  • ip route
  • ip netns
  • ethtool
  • netstat
  • traceroute
  • tcpdump
  • mtr

• ARP

  • How to view the contents of the ARP cache?
  • How to initiate an ARP request manually?

• MTU

  • How to see what is the MTU of a given interface?
  • How do you set MTU?

• Namespaces

  • How to create & delete namespaces?
  • How to enter a specific namespace?

• *Routing

  • How to display the routing table?
  • How to print the IP address of each router that an IP packet traverses along its path to its destination?

• ICMP

  • How do you use it?

Academic Level

• Digital Modulation

  • What is Amplitude Shift keying?
  • What is Frequency Shift Keying?
  • What is Phase Shift keying?

• Multiplexing

  • What is it used for and how it works?

• Wireless networks

  • The hidden terminal problem
  • The exposed terminal problem
  • MACA
    • What is RTS?
    • What is CTS?

• ALOHA

  • Pure
  • Slotted

• Noisy-channel coding theorem

  • Shannon capacity/limit

• CSMA

  • The Binary Exponential Backoff Algorithm

• Stop and Wait

• The adaptive tree walk

• Cryptography

  • Symmetric
  • Asymmetric
  • Digital Signature

• Error Detection

  • Parity Bit
  • Checksum
  • CRC code

• Data transmission

  • Piggybacking

• Error Correction

  • Hamming Code
  • Reed Solomon code
  • The NASA binary convolutional code
  • Low-Density Parity Check code

Cloud Networking (OpenStack Neutron)

• Components

  • API Server
  • Plugins
  • Agents
  • Messaging Queue

• Entities

  • Network
  • Router
  • Port
  • Subnet
  • Security Group

• ML2 Plugin

  • What is it used for?
  • Explain type drivers
  • Explain mechanism drivers

• dnsmasq*

• Floating IP

• Provider Network