Network Concepts Flashcards
What networking concepts should you already be familiar with?
The physical layout of AZs and Regions
VPCs and how to create them
How to create a private and public subnet
What a NAT is and how to disable Source/Dest checks
Route tables and routing terminology (default routes,
local routes, etc.
IPv4 Addressing and subnet mask notation
Intermediate Networking Terminology (MAC address. port, gateway vs router)
What is OSI Layer 1?
Physical layer. Think CAT5, fiber optics, 5GHz carrier
What is OSI Layer 2?
Data Link. Think MAC (lookup MAC if you don’t know what it is).
What is OSI Layer 3?
Network. Think IP, ARP
What is OSI Layer 4?
Transport. Think TCP
What is OSI Layer 5?
Session. Think Setup, Negotiation, teardown.
What is OSI Layer 6?
Presentation. Think TLS/SSL, compression
What is OSI Layer 7?
Application. Think web browser
What is a mnemonic for the OSI layers?
Please do not throw sausage pizza away
Which layers in the OSI stack fall under AWS’s responsibility in the shared service model?
Physical
Data link
Which layers in the OSI stack fall under the customer’s responsibility in the shared service model?
Network, transport, session, presentation, application.
True or false: AWS doesn’t allow multicast communication?
True. This prevents one customer’s data from interacting with another customer’s resources.
Which three network protocols should you definitely know for the exam?
TCP
UDP
ICMP
What is the reliability characteristic of TCP?
Connection-based, stateful, acknowledges receipt.
This means that after each communication, the receiving device must acknowledge receipt.
What is the reliability characteristic of UDP?
Connectionless, stateless, simple, no retransmission delay.
This means the receiving device does not acknowledge receipt.
