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Terms in this set (52)
A portion of the network, limited by its router connection to a specific group of host computers in a common LAN segment.
The common or limited broadcast scheme of all hosts in the broadcast domain.
Also called a subnet.
Routers are used to subdivide a network into ________________
Individual Broadcast Domains
Autonomous System (AS)
A collection of networks under a common administration that share a common routing strategy. Also referred to as a Routing Domain)
Autonomous systems 1-64511
Available by IANA and ARIN
Example of Autonomous System
Internal networks within an Air Force Base
Groups of contiguous networks and attached hosts. Also referred to as Routing Domains.
All interfaces must belong to the same OSPF
Area Border Routers
At least one interface must belong to area 0 (backbone area) and at least one interface must belong to a non-backbone area (such as area 1)
Interfaces must belong to area 0 only
Autonomous System Boundary Router
Router that performs route injection (redistribution) from another route source.
Must-have one of these routing protocols
RIP, EIGRP, OSPF, IS-IS, and BGP
Router types are determined by a router's _____________
Function and/or location within an OSPF area
A device that performs application-layer protocol translation between devices. TCP/IP to a destination using the IPX/SPX stack
Interior Gateway Routers
Used for information exchange within autonomous systems and use a variety of Interior Gateway Protocols (IGPs) to accomplish this purpose.
Interior Gateway Protocols
Routing Information Protocol (RIP)
Interior Gateway Routing Protocol (IGRP)
Open Shortest Path First (OSPF)
Enhanced Interior Gateway Routing Protocol (EIGRP)
Exterior Gateway Routers
Move information between AS and use Exterior Gateway Protocols (EGPs)
Example of routing between Autonomous Systems
Routing from one Air Force Base to another
Border Gateway Protocol (BGP)
Protocol that address the routing of packets among different autonomous systems to connect them. Uses ASN to uniquely identify each system.
an IP address on a layer 3 network device that serves as an access point to or from a network. Setting on a host to provide them with a path to leave the LAN to a remote network, usually on the nearest router interface on their subnet.
A host or subnet would utilize the IP address of the _________ associated storm its own subnet as its default gateway
Process through which additional or alternate instances of network devices, equipment and communication mediums are installed within network infrastructure.
Ensuring network availability in case of a network device or path failure and unavailability.
Redundancy refers to paths and _____________
Redundant Power Supplies
Ensures readily available power for the device in the event the primary power source fails. Drawbacks include no protection for large scale power failures within the network.
Having "hot spares" ready to replace failed equipment - configured exactly the same - to restore network operation
Spreading of traffic from a source node to a destination node over multiple paths through the network. If one path fails, traffic can be rerouted to other available paths.
Bridge-Group Virtual Interface
Routed interface that represents a set of Ethernet interfaces that gets bridged.
By using ___________ technique, a Cisco router can be turn into a layer three switch.
Integrated Routing and Bridging (IRB)
Under normal circumstances, a physical router interface can only be assigned ______ IP address
By creating a ____________________, now there is more than one path for data to flow within the LAN and the router
Each interface on a router is, in face, a separate ____________ as well as a separate _____________
Routers provide routing and related functions that enable multiple data links to be combined into an Internetwork via ________ addressing
Network addresses are sometimes called ________ or ________ addresses
Virtual or logical
The relationship between a network address and a device is logical and ________
Internetworking devices require one network-layer address per _____________ for each network-layer protocol supported.
The network layer supports both _____________ and ____________ from higher layer protocols.
_________ Protocols are standalone or protocols within a protocol suite that are responsible for providing the logical addressing...
Encapsulate data to be sent over the network.
__________ protocols build routing tables
____________ is a network layer 3 protocol that contains addressing information and some control info that enables packets to be routed.
-Provides connectionless, best-effort delivery of packets based on logically assigned addresses
-Provides fragmentation and reassembly of packets to support data links with different MTU sizes
Internet Protocol (IP) - routed
Maximum Transmission Unit (Breakdown & Reassembly)
Data is broken down into segments for transmission by the Transport layer (TCP, UDP). Each segment is given copies of the IP header.
Address Resolution Protocol (ARP)
A protocol used to resolve an IP address to a MAC address.
Memory where the MAC address is associated to the IP address
ARP on single LAN
Broadcast is received and processed by all deceives on the LAN segment but only the host with the correct IP address replies to the ARP request to the originating host containing its MAC address, then send the data to the right MAC
ARP on multiple LANs
Broadcast is also sent to router and router acts as proxy to determine that the remote Host is on a different LAN. Router acts as default gateway to forward traffic to a different network
Sometimes called, Neighbor Discovery, is another protocol that enables network devices to learn the MAC and network layer addresses of other network devices
Internet Control Message Protocol (ICMP)
Network layer internet management protocol that provides message packets to report errors and other info regarding IP Packet processing back to the source.
Generates Massages like Destination Unreachable, Time Exceeded, Echo Request, and Echo Reply
Network-layer protocols that are responsible for determining the destination and overpacked switching.
Internet Protocol Routing
Dynamic - routes to be calculated automatically at regular intervals by software in routing devices
External Router Components
Console Port - configure router directly
Auxiliary Port - configure router remotely
Network Interfaces - allows config over any of the terminals
Internal Router Components
ROM - diagnostic and boot up routines
Flash - memory that holds the OS
NVRAM - non volatile RAM used to store start-up config file
RAM - working memory for the router. Holds running-config file, copy of OS, routing tables, data required by the routing process
Set of options that apply system-wide
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