Block 6 Chapter 1 Flashcards
(50 cards)
A collection of individual networks connected by intermediate networking devices that function as a single large network
An Internetwork
What are the 4 internetworking challenges?
Connectivity between disparate technologies
Reliable Service
Network Management (FCAPS)
Flexibility
What 2 devices are used to segment a network?
Routers and Switches
T/F: Switches and bridges are used to segment a network into collision domains
True
A router creates a _________ Domain
Broadcast
Definition of a Broadcast Domain
A portion of the network limited by its router connection to a specific group of host computers in a common LAN segment
Definition of a Collision Domain
A group of devices connected on the same physical media so that when two devices try to access the medium at the same time, the two signals collide and destroy the data stream
All hosts in a Broadcast Domain share what?
A subnet (A common logical network layer addressing scheme)
A formal set of rules and conventions that governs how computers and network entities exchange information over a network medium
Protocol
The world’s most popular open-system (nonproprietary) protocol suite
TCP/IP
What layer does TCP work at?
Transport Layer (Layer 4)
What layer does IP work at?
Network Layer (Layer 3)
What is the difference between virtual/logical addresses and physical addresses?
Virtual addresses are logical and unfixed, a physical address is unique to that interface
T/F: A router with 3 interfaces running 3 different protocols would require 9 network layer addresses
True, one address is needed for each protocol on an interface
_______ protocols build routing tables whereas _______ protocols encapsulate data to be sent over the network
Routing, Routed
_______ Protocols provide logical addressing that routers use to determine where to send the data packet on its way to the destination network
Routed
Routed Protocols operate at the upper/lower 5 layers of the OSI reference model?
Upper (Application, Presentation, Session, Transport, Network)
A Layer 3 protocol that contains addressing information and some control information that enables packets to be routed
Internet Protocol (IP)
What are the 2 primary responsibilities of IP?
(1) Provide connectionless, best-effort delivery of packets based on logically assigned addresses.
(2) provide fragmentation and reassembly of packets to support data links with different MTU sizes.
What part of IP breaks down packets to ensure they do not exceed the maximum message size of the network they are sent across?
Maximum Transfer Unit (MTU)
MTU has 2 flags, what are they?
“More packets to follow” and “Last fragment”
What protocol maps IP addresses to MAC addresses?
ARP. Address Resolution Protocol
What is the difference of ARP process on a single LAN vs. multiple LANs?
On a single LAN, only the host with the correct IP address replies to the ARP request and the originating host saves that MAC/IP combination.
For Multiple LANs, the local router checks its routing table to tell that the destination is on different LAN and acts as a proxy with its own MAC address for the sending host. This makes that router the Default Gateway
Protocol to enable network devices to learn the MAC and network layer addresses of other network devices
Hello Protocol
