CISA-1220 Routing > 2-7: Routing Dynamically > Flashcards

2-7: Routing Dynamically Flashcards

Dynamic routing protocols are used by routers to facilitate the exchange of routing information between routers. (57 cards)

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1
Q

When configuring RIPng, the ___________ command instructs the router to propagate a static default route.​

A

default-information originate

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1
Q

The primary problem with static routing is?

A

If the network changes, the routing tables have to be manually changed as well.

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1
Q

RIP sends it routing updates broadcast using ___ (UDP | TCP) port ___.

A

UDP port 520

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1
Q

RIPng is based on RIPv2 with a administrative distance of?

A

120

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2
Q

EIGRP & OSPF have fast or slow convergence speeds?

A

Fast

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3
Q

Which two events will trigger the sending of a link-state packet by a link-state routing protocol?

A
  1. A change in the topology
  2. The initial startup of the routing protocol process
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3
Q

Distance vector protocol use _______ pointers to distant networks.

A

limited

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4
Q

The command _________ is used in RIP router configuration mode to enable the sending of subnet masks with the routing updates.

A

Version 2

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5
Q

Which two requirements are necessary before a router configured with a link-state routing protocol can build and send its link-state packets?

A
  1. The router has determined the costs associated with its active links.
  2. The router has established its adjacencies.
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5
Q

What type of routing is typically used on stub networks?

A

Static Routing

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6
Q

What two actions result from entering the network 192.168.1.0 command in RIP configuration mode on a router?

A
  1. Routing updates are sent through all the interfaces belonging to 192.168.1.0.
  2. The network address 192.168.1.0 is advertised to the neighbor routers.
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7
Q

Which dynamic routing protocol was developed as an exterior gateway protocol to interconnect different Internet providers?

A

EIGRP

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7
Q

Which two statements are true regarding classless routing protocols?

A
  1. Allows for use of both 192.168.1.0/30 and 192.168.1.16/28 subnets in the same topology
  2. Sends subnet mask information in routing updates
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7
Q

RIPng uses what multicast address?

A

FF02::9

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8
Q

The IGP routing protocol group consists of what routing protocols?

A
  1. RIP
  2. OSPF
  3. EIGRP
  4. IS-IS
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9
Q

What type of routing is best used for large networks?

A

Dynamic Routing

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9
Q

Static Routing can be advantagieous because?

A

It does not use any CPU or network bandwidth

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10
Q

Convergance is?

A

The time required for all routers to have complete and accurate information about routes.

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11
Q

IGRP and EIGRP use what algorithm?

A

Diffusion Update Algorithm

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11
Q

To enable RIPv2 on a router, you use the router ip command as well as?

A

version 2

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14
Q

What are some of the cons to using a Dynamic Routing Protocol?

A
  • CPU & memory usage can be high
  • Network bandwidth usage
  • Less secure – router conversations can be intercepted
  • Experienced administrator required
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16
Q

Less routing overhead is a routing charastics of what type of protocol?

A

Static Routing

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17
Q

Two distance vector routing protocols?

18
Q

What is different between IPv6 routing table entries compared to IPv4 routing table entries?

Study These Flashcards
A

By design IPv6 is classless so all routes are effectively level 1 ultimate routes.

19
RIP sends it routing updates broadcast every ___ seconds?
30
20
Fast convergence is a disadvantage or advantage?
Advantage
21
Classful routing protocols do not send what in their routing updates?
subnet masks
22
Which dynamic routing protocol has the slowest convergence speed?
RIP
24
CPU Processing Time is a disadvantage or advantage?
Disadvantage
24
In general, there are three actions performed by a dynamic routing protocol. They are?
1. Sends & Receives routing messages on its interfaces 2. Shared messages and routing information with other routers that use the same protocol to learn about remote networks 3. Advertise changes to other routers whenever they occur.
25
RIP uses what algorithm?
Bellman-Ford
27
Memory Usage is a disadvantage or advantage?
Disadvantage
28
Two link-state routing protocols?
1. OSPF 2. IS-IS
29
In the context of routing protocols, what is a definition for time to convergence?
The amount of time for the routing tables to achieve a consistent state after a topology change
30
Which two requirements are used to determine if a route can be considered as an ultimate route in a router’s routing table?
1. Contain a next-hop IP address 2. Contain an exit interface
32
Bandwidth consumption is a disadvantage or advantage?
Disadvantage
33
Which interface will be the exit interface to forward a data packet with the destination IP address 172.16.0.66?
Serial0/0/1
34
A destination route in the routing table is indicated with a code D. Which kind of route entry is this?
A route dynamically learned through the EIGRP routing protocol
35
What type of routing will automatically add new networks to the routing table?
Dynamic Routing
37
Level 2 child routes are always ________ routes.
ultimate
39
RIPv2 uses what multicast address?
224.0.0.9
41
OSPF is used in the network. Which path will be chosen by OSPF to send data packets from Net A to Net B?
R1, R3, R5, R7
42
To enable RIP on a router, you use what command?
router rip
43
Building a topological map is a disadvantage or advantage?
Advantage
44
Event driven updates are a disadvantage or advantage?
Advantage
45
What two tasks do dynamic routing protocols perform?
1. Update and maintain routing tables 2. Network discovery
46
What two routing protocols are Classful?
RIPv1 and IGRP
47
The two link-state routing protocols are?
1. OSPF 2. IS-IS
48
What is the purpose of the passive-interface command?
Allows a router to receive routing updates on an interface but not send updates via that interface
50
Which route is the best match for a packet entering a router with a destination address of 10.16.0.2?
S 10.16.0.0/24 [1/0] via 192.168.0.9
51
Which route will a router use to forward an IPv4 packet after examining its routing table for the best match with the destination address?
A level 1 ultimate route
52
Link-state protocols have complete knowledge of the entire network and all routers have the same what?
Map
53
Based on the partial output from the show ip route command, what two facts can be determined about the RIP routing protocol?
1. RIP version 2 is running on this router and its RIP neighbor. 2. The command no auto-summary has been used on the RIP neighbor router.
54
You use the default-information originate command on what router?
The edge router
55
Which two statements describe the OSPF routing protocol?
1. Calculates its metric using bandwidth 2. Uses Dijkstra’s algorithm to build the SPF tree
56
There are two types of routing protocols, what are they?
* IGP * EGP
57
The EGP routing protocol group consists of what routing protocols?
BGP
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