300-410 Route Redistribution Practice Test 4 — 15 Questions

Question 1

A network engineer runs the following command to troubleshoot a Route Redistribution issue:

R1# show ip ospf database external

And sees the following output:

OSPF Router with ID (1.1.1.1) (Process ID 1)

Type-5 AS External Link States

LS age: 360
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 192.168.10.0 (External Network Number )
  Advertising Router: 2.2.2.2
  LS Seq Number: 80000001
  Checksum: 0x1234
  Length: 36
  Network Mask: /24
       Metric Type: 2 (Larger than any link state path)
       TOS: 0
       Metric: 20
       Forward Address: 0.0.0.0
       External Route Tag: 100

What does this output indicate?

Accepted Answer

The route is redistributed into OSPF with a metric of 20 and a route tag of 100.. The show ip ospf database external output shows a Type 5 LSA for 192.168.10.0/24, with metric type 2 and metric 20, and external route tag 100. This indicates that the route is redistributed into OSPF from another protocol (likely EIGRP or BGP) by router 2.2.2.2. The tag 100 can be used for filtering.

Answer

The route 192.168.10.0/24 is an OSPF internal route.

Answer

The forward address is 0.0.0.0, meaning the route is not reachable.

Answer

The route is a default route redistributed into OSPF.

Question 2

A network engineer runs the following command to troubleshoot a Route Redistribution issue:

R1# debug ip bgp updates

And sees the following output:

*Mar  1 00:25:44.789: BGP(0): 10.1.1.2 UPDATE out about 192.168.10.0/24, NEXT_HOP 10.1.1.1, LOCAL_PREF 100, MED 0, origin i, path 65000 65001
*Mar  1 00:25:44.790: BGP(0): 10.1.1.2 UPDATE run, update sent
*Mar  1 00:25:44.791: BGP(0): 10.1.1.2 UPDATE in about 10.2.2.0/24, NEXT_HOP 10.1.1.2, LOCAL_PREF 100, MED 0, origin i, path 65002

What does this output indicate?

Accepted Answer

R1 is advertising 192.168.10.0/24 to neighbor 10.1.1.2 and learning 10.2.2.0/24 from the same neighbor.. The debug ip bgp updates output shows BGP updates being sent and received. R1 sends an update for 192.168.10.0/24 with AS path 65000 65001 and receives an update for 10.2.2.0/24 with AS path 65002. This indicates BGP is exchanging routes, but if redistribution is expected, the AS path may indicate the route origin.

Answer

BGP is redistributing routes from OSPF into BGP, as shown by the AS path.

Answer

The route 192.168.10.0/24 is being filtered due to AS path length.

Answer

BGP is not receiving any routes because of a redistribution issue.

Question 3

A network engineer runs the following command to troubleshoot a Route Redistribution issue:

R1# show bgp ipv4 unicast 192.168.10.0/24

And sees the following output:

BGP routing table entry for 192.168.10.0/24, version 2
Paths: (1 available, best #1, table default)
  Advertised to update-groups:
     1
  Refresh Epoch 1
  Local
    0.0.0.0 from 0.0.0.0 (1.1.1.1)
      Origin incomplete, metric 0, localpref 100, weight 32768, valid, sourced, best
      rx pathid: 0, tx pathid: 0x0

What does this output indicate?

Accepted Answer

The route is redistributed into BGP from another protocol, as indicated by origin incomplete and weight 32768.. The show bgp ipv4 unicast output shows a route with next hop 0.0.0.0, origin incomplete, and weight 32768. This indicates the route is locally originated, likely via redistribution or network command. Origin incomplete (incomplete) suggests the route was redistributed from another protocol.

Answer

The route 192.168.10.0/24 is learned from an EBGP neighbor.

Answer

The route is injected into BGP via the network command, as shown by origin incomplete.

Answer

The route is a default route injected into BGP.

Question 4

A network engineer runs the following command to troubleshoot a Route Redistribution issue:

R1# show ip route summary

And sees the following output:

Route Source    Networks    Subnets    Replicates    Overhead    Memory (bytes)
connected       2           0          0             0           512
static          1           0          0             0           256
ospf 1          5           0          0             0           1280
eigrp 100       3           0          0             0           768
bgp 65000       2           0          0             0           512
internal        1           0          0             0           256
Total           14          0          0             0           3584

What does this output indicate?

Accepted Answer

The router has 14 routes total, with OSPF contributing the most routes.. The show ip route summary output provides a count of routes from each source. It shows that OSPF has 5 routes, EIGRP has 3, BGP has 2, and static has 1. This can help identify if redistribution is working by comparing expected routes.

Answer

The router is not redistributing any routes because the counts are low.

Answer

BGP is the only protocol with external routes.

Answer

EIGRP has 3 routes, all of which are redistributed from OSPF.

Question 5

A network engineer runs the following command to troubleshoot a Route Redistribution issue:

R1# show ip bgp vpnv4 vrf CUSTOMER routes

And sees the following output:

Network          Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 100:1 (default for vrf CUSTOMER)
*> 192.168.10.0/24  10.1.1.2                 0    100      0 65001 i
*> 192.168.20.0/24  10.1.1.2                 0    100      0 65001 i

What does this output indicate?

Accepted Answer

The VRF CUSTOMER has two routes learned via BGP from AS 65001.. The show ip bgp vpnv4 vrf output shows routes in a VRF. The routes are learned from neighbor 10.1.1.2 with AS path 65001. This indicates that the VRF is receiving routes via BGP, possibly from a PE router. If redistribution is expected from another protocol into BGP within the VRF, these routes may be the result.

Answer

The routes are redistributed from OSPF into BGP within the VRF.

Answer

The VRF is not receiving any routes because of a redistribution issue.

Answer

The routes are locally originated within the VRF.

Question 6

What is the default administrative distance for routes redistributed into EIGRP from another protocol?

Accepted Answer

170. By default, EIGRP assigns an administrative distance of 170 to routes learned via redistribution, distinguishing them from internal EIGRP routes (AD 90) and external EIGRP routes (AD 170).

Answer

90

Answer

110

Answer

200

Question 7

When redistributing routes into OSPF, which OSPF metric value is assigned by default if none is specified?

Accepted Answer

20. Cisco IOS assigns a default metric of 20 to redistributed routes into OSPF, except for BGP routes which default to 1.

Answer

1

Answer

10

Answer

100

Question 8

Which statement correctly describes the behavior of the 'default-information originate' command in OSPF?

Accepted Answer

It injects a default route as a Type 5 LSA only if a default route exists in the routing table.. The 'default-information originate' command in OSPF generates a default route (0.0.0.0/0) as a Type 5 LSA, but only if a default route exists in the routing table, unless the 'always' keyword is used.

Answer

It always injects a default route into OSPF regardless of the routing table.

Answer

It injects a default route as a Type 3 LSA.

Answer

It injects a default route as a Type 7 LSA in all OSPF areas.

Question 9

What is the default seed metric used by Cisco IOS when redistributing routes into RIP?

Accepted Answer

0. By default, RIP assigns a seed metric of 0 to redistributed routes, which makes them unreachable unless a metric is explicitly configured.

Answer

1

Answer

15

Answer

16

Question 10

Which loop prevention mechanism is used by default when redistributing between two OSPF processes?

Accepted Answer

Route tagging with default tag 0. When redistributing between OSPF processes, Cisco IOS uses route tagging (tag field in the OSPF external LSA) to prevent loops, but the default tag value is 0 unless explicitly set.

Answer

Split horizon

Answer

Poison reverse

Answer

Hold-down timers

Question 11

What is the default metric value assigned to redistributed routes into IS-IS when no metric is specified?

Accepted Answer

0. By default, Cisco IOS assigns a metric of 0 to routes redistributed into IS-IS, which can cause suboptimal routing if not modified.

Answer

10

Answer

20

Answer

63

Question 12

Which statement correctly describes the behavior of the 'subnets' keyword when redistributing into OSPF?

Accepted Answer

It allows OSPF to redistribute subnetted routes in addition to classful networks.. Without the 'subnets' keyword, OSPF redistributes only classful network routes; the 'subnets' keyword allows redistribution of subnetted routes, which is essential for proper routing.

Answer

It causes OSPF to redistribute only classful network routes.

Answer

It changes the metric of redistributed routes to the interface cost.

Answer

It is required only when redistributing BGP routes into OSPF.

Question 13

What is the default administrative distance for routes redistributed into BGP from an IGP?

Accepted Answer

20. Routes redistributed into BGP from an IGP are considered external BGP (eBGP) routes and have a default administrative distance of 20.

Answer

110

Answer

170

Answer

200

Question 14

When redistributing OSPF into EIGRP, which EIGRP metric components are used to calculate the default metric?

Accepted Answer

No default metric is assigned; redistribution fails unless a metric is configured.. EIGRP requires all five K-values (bandwidth, delay, reliability, load, MTU) for metric calculation, but by default, only bandwidth and delay are used; the default metric for redistribution is not automatically derived and must be explicitly set.

Answer

Bandwidth and delay only

Answer

Bandwidth, delay, reliability, load, and MTU

Answer

The OSPF cost is converted to an EIGRP metric using a default formula.

Question 15

Drag and drop the steps to perform mutual redistribution between OSPF and EIGRP into the correct order, from first to last.

Accepted Answer

Identify OSPF and EIGRP domains and interfaces. The correct order ensures that route filtering is applied before redistribution to prevent routing loops, and that redistribution is configured on both protocols symmetrically. First, identify the routing domains and interfaces. Second, configure route filtering using distribute-lists or route-maps to control which routes are exchanged. Third, configure redistribution of EIGRP into OSPF. Fourth, configure redistribution of OSPF into EIGRP. Finally, verify the redistribution using show commands to confirm routes are exchanged correctly.