Ccnp Route, Chapter 4 - Eigrp Over Frame Relay, Chapter 5 -Advanced Features

Front 1

NBMA

Back 1

Non broacast multi-access network

NBMA is a network that cannot broadcast frames. A well known example is Frame Relay.

Front 2

Inverse ARP

Back 2

InARP enables a Frame Relay station to discover the protocol address of a station that is associated with the virtual circuit. It is more efficient than sending ARP messages over every virtual circuit for every address that the system wants to resolve, and it is more flexible than relying on a static configuration. Basic InARP operates essentially the same as ARP, with the exception that InARP does not broadcast requests. This is because the hardware address of the destination station is already known. A requesting station simply formats a request by inserting its source hardware, protocol addresses, and the known target hardware address. It then zero fills the target protocol address field. Finally, it encapsulates the packet for the specific network and sends it directly to the target station.

Front 3

Frame relay Cloud

Back 3

The frame relay switch is called a frame relay cloud

Front 4

Virtual Circuits

Back 4

A virtual circuit is a circuit or path between points in a network that appears to be a discrete, physical path but is actually a managed pool of circuit resources from which specific circuits are allocated as needed to meet traffic requirements

Front 5

PVC

Back 5

Permanent Virtual Circuit

Another name for Virtual Circuit

Front 6

CIR

Back 6

Committed Information Rate

This is the internet speed you are guarenteed.

Front 7

LMI

Back 7

Local Management Interface

is a signaling standard used between routers and frame relay switches. Communication takes place between a router and the first frame relay switch it's connected to.

Front 8

KeepAlive

Back 8

A keepalive signal is often set at predefined intervals, and plays an important role on the Internet. After a signal is sent, if no reply is received the link is assumed to be down and future data will be routed via another path until the link is up again. A keepalive signal can also be used to indicate to Internet infrastructure that the connection should be preserved

Front 9

DLCI

Back 9

Data Link Connection Identifier

The DLCI is a number, assigned by the service provider for a specific PVC (Permanent Virtual Circuit).

Front 10

What are the 3 types of LMI

Back 10

Local Management Interface

1. Cisco

2. ANSI T1.617 Annex D

3. ITU-T Q.933 Annex A

Front 11

For each PVC how many DLCI will you get per router?

Back 11

1

Front 12

What is specific to each router in frame relay?

Back 12

DLCI are localy known to each individual router.

Front 13

What topologies does frame relay support?

Back 13

1. Full-Mesh

2. Partial Mesh

3. Hub and Spoke

Front 14

NBMA

Back 14

Non-broadcast multi-access

the frame relay is multi-access all routers can accesss the network, but you are unable to send broadcasts over the frame-relay network. No broadcast also means you are unable to send multi-cast traffic.

Front 15

Split-Horizon

Back 15

Split horizon is a method of preventing a routing loop in a network.

Front 16

What is the split-horizon rule?

Back 16

Whatever you learn on an interface you don't advertise it back out on the same interface.

Front 17

We are using two PVC's but on router there is still only one physical interface. Split Horizon will prevent the advertisement of routing information.

How do you solve this problem?

Back 17

1. Disable split-horizon (the default physical interfaces)

2. You can use sub-interfaces

Front 18

Will Point-to-point cause split-horizon issues?

Back 18

No, It will solve your split-horizon problems but you will need to use a different IP subnet per PVC.

Front 19

Will Point-to-multi-point cause split-horizon issues?

Back 19

Yes, you will have split horizon problems but you can use a single IP subnet for all PVCs.

Front 20

Inverse ARP

Back 20

This will map your local DLCI to the IP address on the other side

Front 21

What happens when we configure frame relay?

Back 21

1. Our router will do a status inquiry
2. The frame-relay switch will give us our DLCI number (or you can configure it yourself)

Front 22

What command shows the inverse ARP of frame-relay?

Back 22

Show frame-relay map

Front 23

In the command show frame-relay map what does the word dynamic mean?

Back 23

we are using inverse ARP

Front 24

In the command show frame relay-map what does the word broadcast mean?

Back 24

it means it is emulating broadcast traffic so we can use multicast as well. Inverse ARP enabled this for us.

Front 25

What command disables inverse ARP?

Back 25

no frame-relay inverse-arp

Front 26

After you remove inverse ARP you must remove pre-learnt frame-relay mappings. What command does this?

Back 26

clear frame-relay inarp

Front 27

What command allows you to configure the frame-relay interface level?

Back 27

Frame-relay map

Front 28

If you do not specifiy this keyword your frame-relay network will only support unicast.

Back 28

Broadcast

NOTE:

Since EIGRP uses multi-cast you'll run into trouble if you forget to use this

Front 29

On a physical interface split-horizon is ___________

Back 29

Disabled

Front 30

On a sub-interface split-horizon is _____

Back 30

enabled

Front 31

If you specify a neighbor in EIGRP what happens?

Back 31

You will switch to unicast

Front 32

In EIGR point-to-point links require _______________

Back 32

IP subnet per PVC

Front 33

In point-to-point subinterface commands which command allows your router to determine which subinterfaces and which DLCI should be used?

Back 33

frame-relay interface-dlci

Front 34

What is the default bandwidth that EIGRP traffic can use?

Back 34

up to 50%

Front 35

On multipoint interfaces how is the bandwidth divided?

Back 35

It is divided by the number of neighbors

Front 36

How can you cange the bandwidth used by EIGRP?

Back 36

The Bandwidth command

EX)

cisco(config-subif)#bandwidth 64

Front 37

If you change the bandwidth on the subinterface what happens to the physical interface?

Back 37

The physical interface bandwidth will not change

Front 38

What command allows you to see the bandwidth?

Back 38

Show interface

Front 39

What command allows you to change the percentage of bandwidth used for EIGRP?

Back 39

ip bandwidth-percent eigrp

NOTE:

Changing this wil influence the metric

Front 40

Receive-only

Back 40

The stub router will not advertise any network

Front 41

Connected

Back 41

Allows the stub router to advertise static routes (you have to redistribute them)

Front 42

Static

Back 42

Allows the stub router to advertise summary routes

Front 43

Redistribute

Back 43

Allows the stub router to advertise redistribute routes

Front 44

What is the most common EIGRP Stub?

Back 44

A combination of connection and summary