578 - Module A questions & answers.

578 - Module A questions & answers
Access router - Heart of the network
- A switch
- Usually has built-in wireless access points
- A router
- Supports Dynamic Host Configuration Protocol (DHCP)
- Provides Network Address Translation (NAT)


DHCP - Dynamic Host Configuration Protocol


NAT - Network Address Translation


SPI - Static Packet Inspection firewall - for added security


Three Core Standard Layers - - Application
- Internetworking
- Network


Super Layer - Application - Communication between application
programs on different hosts attached to different networks on an
Internet

, Super Layer - Internetworking - Transmission of packets across an
Internet. Packets contain application layer messages.


Super Layer - Network - Transmission of frames across a single network.
Frames contain packets.


Physical link - Connects adjacent devices in a single network


Data link - Path that a frame takes across a single network


Transport layer - - End-to-end or host-to-host
- TCP is connection oriented, reliable


Internet layer - - Usually IP
- Hop-by-hop (host-router or router-router)
- Connectionless, unreliable


TCP - Transmission Control Protocol
- Connection-oriented, like telephone conversation
- Reliable