Block 6/ 2A Flashcards
Special static ROUTE manually defined by the system administrator as the path to take when no ROUTE to the destination is known.
Default ROUTES
Manually defined by the system administrator as the only path to the destination.
Useful for controlling security and reducing traffic
Static Routes
__________ is another name for a default route. Router to which all non-routable packets are sent
Gateway of Last Resort
__________ is defined as a network that is NOT listed in a router’s routing table.
Non-Routable
A ___________ is a NETWORK LAYER protocol that exchanges information packets with otter inter work routers in order to build and maintain a routing table.
Dynamically learned routes (Routing Protocol)
List some common metrics:
Path length Reliability Delay Bandwidth Load Communication cost
______ is the MOST COMMON routing metric.
Sum of the costs associated with each link traversed.
Path length
Metric that specifies the number of passes through internetworking devices, such as routers.
Hop Count
_______ refers to the dependability of each network link.
Reliability
_____ refers to the length of time required to move a packet from source to destination through the internetwork.
Delay
_____ is a conglomeration of several important variables. Common and useful metric.
Delay
Refers to the available traffic capacity of a link.
Bandwidth
____ refers to the degree to which a network resource, such as a router, is busy
Load
Metric that is set by the Network Administrator
Communication Cost
_______ __________ initialize and maintain routing tables.
Routing Algorithms
What are the classification of algorithms?
Single-Path or Multi-Path
Flat or Hierarchical
Intra-domain or Inter-domain
Distance vector or Link state
_____ ____ algorithms send packets to a destination using the same or SINGLE PATH unless there is a topology change that affects the available route.
Single-Path algorithms
_____ ____ algorithms support multiple paths to the same destination by LOAD BALANCING or load sharing.
Multi-Path algorithms
____ algorithms in a flat routing system, the routers are peers of all others.
Sometimes referred to as “Classful” routing
Flat algorithms
____________ algorithms is called “Classless” routing and supports Variable Length Subnet Masks (VLSM).
Hierarchical algorithms
____________ ______ Routing system that often designates logical groups of nodes, called domains, autonomous systems, or areas.
Hierarchical System
Work only within a routing domain and are used with Interior Gateway Protocols.
Intra-domain algorithms
______-_______ algorithms are used with EXTERIOR Gateway Protocols (EGP).
Inter-Domain Algorithms
_____-______ algorithms exchange routing information within and between Autonomous System such as on the internet
INTER-domain algorithms
________ ______ algorithms use an approach that determines the direction and distance to any link in the internetwork.
Known as Classful routing
Distance Vector algorithms
An advantage of ______ ______ is that they are simple to understand and configure as well as not requiring much from the routers processor to maintain the routing table.
Distance Vector algorithm
Limited hop count and being update by broadcast are disadvantages of _______ ______
Distance Vector
____ _____ algorithms are also known as shortest path first algorithms.
Link State Algorithms
____ _____ algorithms send small updates everywhere.
Less prone to routing loops
and move expensive to implement and support.
Link State algorithms
Distance Vector, Link State and Balanced Hybrid are examples of:
Classes of Protocols
Which protocols are examples of the distance vector protocol?
Router information protocol (RIP) and
Interior gateway routing protocol (IGRP)
This protocol is considered a pure distance vector routing protocol and periodically sends complete routing table updates to it’s neighbor.
Max allowable hop out is 15
Routing information protocol (RIP)
This distance vector protocol is only available on Cisco devices.
Interior gateway routing protocol (IGRP)
Uses an autonomous system number to only share routing information with other routers that are configured with the same number.
Interior gateway routing protocol (IGRP)
Max hop count is 255 with a normal spanning about 100 hops.
Interior gateway routing protocol (IGRP)
This system is NOT Cysco specific and only sends information which describes the state of it’s own links to all the routers within the SAME hierarchical area
Open shortest path first (OSPF)
What is the largest entity within the hierarchy of open shortest path first (OSPF)?
Autonomous System (AS)
INTRA-area & INTER-areas are two different types of____?
Open shortest path first (OSPF)
_____ ____ routing occurs when the source and destination are in the same area.
INTRA-Area
_____ ____ routing occurs when they are in different areas.
INTER-area routing
Responsible for distributing routing information between areas.
Backbone
____ ______________ uses the open shortest path first (OSPF) HELLO protocol
OSPF Initialization
When a router discovers a new neighbor, it records the neighbors address and interface as an entry in ____________ _________
Neighborship Database
______ ______ is an overall picture of networks in relationship to routers.
Topological Database
_____ ______ Responsible for generating Link State Advertisements for the entire area so only one router is responsible for sending multicast updates.
Designated Router
_______ algorithm that uses the information from the topological database to calculate entries for insertion into the routing table
(SPF) algorithm
