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Cisco Chapter 3

Terms in this set (40)

identifies how the route was learned
route source
identifies the address of a remote network
destination network
identifies the value assigned to reach a remote network
metric
identifies the trustworthiness of a route source
administrative distance
Which two route source codes are automatically created within a routing table whenever a router interface is configured with an IP address and activated?
C and L
In the process of building and maintaining a larger network, you will find that
dynamic routing is simpler to configure than static routing.
What is the purpose of classifying Cisco IP routing table entries as ultimate route, level 1 route, level 1 parent route, and level 2 child routes?
to explain the operation of the hierarchical structure of the routing table
What type of route has a network address with a subnet mask that is less than the classful equivalent?
a supernet route
A network administrator has examined the routing table of a router and noted that the entry for the destination network 172.16.4.0/24 begins with the letter D. What does this letter signify?
The route source was learned dynamically
Which route would be used to forward a packet with a source IPv6 address of 2001:DB8:F00D:1::1 and a destination IPv6 address of 2001:DB8:CAFE:2::1?
R 2001:DB8:CAFE:2::/64 [120/3] via FE80::201:84FF:FEAC:8501, GigabitEthernet0/0
What are two functions of dynamic routing protocols?
to maintain routing tables and to discover the network
A network administrator is examining a RIPv2 routing table and notices that several subnets are advertised in individual entries. What can an administrator do to enable a RIPv2 router to automatically group multiple directly attached subnetworks into a single network statement?
use the auto-summary command
The steps that are taken by a router in the route look up process when it receives a packet, there is no match, and the packet is eventually dropped.
1. examining level 1 network routes for the best match
2. examining child routes of the parent route for the best match
3. searching level 1 supernet routes for the best match
4. determining if a default route exists
5. dropping the packet
What occurs next in the router lookup process after a router identifies a destination IPv6 address and locates a matching level 1 network route?
The router forwards the packet.
What protocols are used to dynamically exchange routing information between routers?
routing
prevents the forwarding of RIP updates out of specified LAN interfaces
the passive-interface command
a route with a subnet mask equal to or less than the classful mask of the network address
Level 1 route
identifies the exit interface to use to forward a packet toward the final destination
outgoing interface
a route with the address 0.0.0.0/0
default route
propagates the configured static default route configured into routing protocol updates
default-information originate command
prevents the forwarding of RIP updates out all interfaces
the passive-interface default command
identifies the IPv4 address of the next router to forward the packet to
the next hop
Data structures; Routing protocol messages ; Algorithm
Three main components of dynamic routing protocols
The route was learned dynamically from another router via the EIGRP routing protocol.
the route source identified as an D
displays the IPv4 routing protocol settings currently configured on the router
the show ip protocols command
The route was learned dynamically from another router via the OSPF routing protocol.
the route source identified as an O
a route with subnet mask equal to that of the classful mask
network route
the routing protocol used between Internet service providers (ISPs)
border gateway protocol (BGP)
a route with a subnet mask greater than the classful mask of the network address
Level 2 child route
displays the RIP routes installed in the routing table
the show ip route command
identifies from when the route was last heard
route timestamp
The routes are not easy to implement in a large network.; Managing the static configurations can become time consuming.; If a link fails, a static route cannot reroute traffic.
disadvantages of static routes
The route was manually created by an administrator to reach a specific network.
the route source identified as an S
The route was learned dynamically from another router via the RIP routing protocol.
the route source identified as an R
used to facilitate the exchange of routing information between routers
Routing Protocols
a Level 1 network route that is subnetted
parent route
Discovery of remote networks; Maintaining up-to-date routing information; Choosing the best path to destination networks; Ability to find a new best path if the current path is no longer available
The purpose of dynamic routing protocols
a route with a subnet mask less than the classful mask of the network address
supernet route
a route that has either a next-hop IPv4 address or an exit interface
ultimate route or level 2 child route
An ultimate route is a routing table entry that contains either a next-hop IPv4 address or an exit interface.
Directly connected, dynamically learned, and local routes are ultimate routes.
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