300-410 Administrative Distance Practice Test 4 — 15 Questions

Question 1

A network engineer runs the following command to troubleshoot an Administrative Distance issue:

R1# show bgp ipv4 unicast 192.168.4.0/24
BGP routing table entry for 192.168.4.0/24, version 2
Paths: (1 available, best #1, table default)
  Advertised to update-groups:
     1
  Refresh Epoch 1
  Local
    10.1.1.2 from 10.1.1.2 (2.2.2.2)
      Origin IGP, metric 0, localpref 100, valid, external, best
      rx pathid: 0, tx pathid: 0x0

What does this output indicate?

Accepted Answer

The route is an external BGP route with administrative distance 20.. The output shows BGP route details including the path attributes. The administrative distance for BGP external routes is 20 by default, but this is not shown here. The output indicates the route is learned via eBGP and is the best path.

Answer

The route is an internal BGP route with administrative distance 200.

Answer

The route has a local preference of 200, making it preferred.

Answer

The route is not the best path because it is external.

Question 2

A network engineer runs the following command to troubleshoot an Administrative Distance issue:

R1# show ip route summary
Route Source    Networks    Subnets    Overhead    Memory (bytes)
connected       2           0          0           512
static          1           0          0           256
eigrp 100       3           0          0           768
ospf 1          2           0          0           512
bgp 65001       1           0          0           256
internal        1           0          0           256
Total           10          0          0           2560

What does this output indicate?

Accepted Answer

The router has 10 routes total, with EIGRP contributing the most routes.. The output shows a summary of routes from different sources. It does not show administrative distance values directly, but it lists the routing protocols and their route counts.

Answer

The administrative distance for EIGRP routes is 90.

Answer

The router is redistributing between OSPF and EIGRP.

Answer

The BGP route is preferred over the OSPF route for the same prefix.

Question 3

A network engineer runs the following command to troubleshoot an Administrative Distance issue:

R1# debug eigrp packets
EIGRP Packets debugging is on
    (UPDATE, REQUEST, QUERY, REPLY, HELLO, IPXSAP, PROBE, ACK, STUB, SIAQUERY, SIAREPLY)
*Mar  1 00:01:23.456: EIGRP: received UPDATE on GigabitEthernet0/0 nbr 10.1.1.2
*Mar  1 00:01:23.456:   AS 100, Flags 0x0, Seq 1/0 idbQ 0/0 iidbQ un/rely 0/0
*Mar  1 00:01:23.456:   Int: 192.168.5.0/24, metric 30720/28160
*Mar  1 00:01:23.456: EIGRP: Enqueueing UPDATE on GigabitEthernet0/0 nbr 10.1.1.2 iidbQ un/rely 0/1 peerQ un/rely 0/0 serno 1-1

What does this output indicate?

Accepted Answer

The router is receiving an EIGRP update for network 192.168.5.0/24 with a composite metric of 30720/28160.. The debug output shows EIGRP packet exchanges. It does not directly show administrative distance, but it indicates that an update is being sent and received for a specific network.

Answer

The administrative distance for this route is 90 because it is internal.

Answer

The router is sending a query for network 192.168.5.0/24.

Answer

The EIGRP neighbor relationship is down.

Question 4

A network engineer runs the following command to troubleshoot an Administrative Distance issue:

R1# show ip route 10.0.0.0 255.0.0.0
Routing entry for 10.0.0.0/8
  Known via "static", distance 1, metric 0
  Redistributing via eigrp 100
  Last update from 10.1.1.2 on GigabitEthernet0/0, 00:00:05 ago
  Routing Descriptor Blocks:
  * 10.1.1.2, from 10.1.1.2, 00:00:05 ago, via GigabitEthernet0/0
      Route metric is 0, traffic share count is 1

What does this output indicate?

Accepted Answer

The route is a static route with administrative distance 1, which is the default for static routes pointing to an interface.. The output shows a static route with administrative distance 1, which is the default for static routes. This route is being redistributed into EIGRP.

Answer

The route is an EIGRP route with administrative distance 90.

Answer

The route is being redistributed from EIGRP into static.

Answer

The route has an administrative distance of 170 because it is external.

Question 5

A network engineer runs the following command to troubleshoot an Administrative Distance issue:

R1# show ip route 172.16.0.0 255.255.0.0
Routing entry for 172.16.0.0/16
  Known via "ospf 1", distance 110, metric 20, type intra area
  Last update from 10.1.1.2 on GigabitEthernet0/0, 00:00:05 ago
  Routing Descriptor Blocks:
  * 10.1.1.2, from 2.2.2.2, 00:00:05 ago, via GigabitEthernet0/0
      Route metric is 20, traffic share count is 1

What does this output indicate?

Accepted Answer

The route is an OSPF intra-area route with administrative distance 110, which is the default for OSPF.. The output shows an OSPF intra-area route with administrative distance 110, which is the default for OSPF. The metric is 20, and the route is learned from neighbor 2.2.2.2.

Answer

The route is an OSPF external route with administrative distance 110.

Answer

The route has an administrative distance of 20 because it is an OSPF route.

Answer

The route is preferred over an EIGRP route with AD 90.

Question 6

What is the default administrative distance for a route learned via the Enhanced Interior Gateway Routing Protocol (EIGRP) summary route?

Accepted Answer

5. EIGRP summary routes have a default administrative distance of 5, which is lower than the standard EIGRP internal distance of 90 and EIGRP external distance of 170.

Answer

90

Answer

170

Answer

1

Question 7

Which default administrative distance is assigned to routes learned via the Open Shortest Path First (OSPF) protocol?

Accepted Answer

110. OSPF routes have a default administrative distance of 110, as defined by Cisco IOS.

Answer

90

Answer

115

Answer

120

Question 8

What is the default administrative distance for a route learned via the Routing Information Protocol (RIP)?

Accepted Answer

120. RIP routes have a default administrative distance of 120.

Answer

100

Answer

110

Answer

130

Question 9

What is the default administrative distance for a route learned via the Border Gateway Protocol (BGP) from an external peer (eBGP)?

Accepted Answer

20. eBGP routes have a default administrative distance of 20, which is lower than iBGP's default AD of 200.

Answer

200

Answer

170

Answer

1

Question 10

What is the default administrative distance for a route learned via the Intermediate System-to-Intermediate System (IS-IS) protocol?

Accepted Answer

115. IS-IS routes have a default administrative distance of 115.

Answer

110

Answer

120

Answer

90

Question 11

Which default administrative distance is assigned to a directly connected interface route?

Accepted Answer

0. Directly connected routes have a default administrative distance of 0, indicating the highest preference.

Answer

1

Answer

5

Answer

110

Question 12

What is the default administrative distance for a static route pointing to an interface (e.g., 'ip route 10.0.0.0 255.0.0.0 GigabitEthernet0/1')?

Accepted Answer

0. A static route configured with an exit interface (not a next-hop IP) has a default AD of 0, because it is treated as a directly connected route. However, if a next-hop IP is specified, the default AD is 1.

Answer

1

Answer

5

Answer

110

Question 13

What is the default administrative distance for a route learned via the Routing Information Protocol next generation (RIPng)?

Accepted Answer

120. RIPng, the IPv6 version of RIP, uses the same default administrative distance as RIPv2, which is 120.

Answer

110

Answer

100

Answer

170

Question 14

Which statement about administrative distance is true regarding the selection of routes in a routing table?

Accepted Answer

The route with the lowest administrative distance is installed in the routing table.. When a router receives multiple routes to the same destination from different routing protocols, the route with the lowest administrative distance is installed in the routing table, regardless of metric.

Answer

Routes with higher administrative distance are always preferred.

Answer

Administrative distance is only considered when metrics are equal.

Answer

Administrative distance is used to select the best path within the same routing protocol.

Question 15

Drag and drop the steps to troubleshoot suboptimal routing due to incorrect Administrative Distance values into the correct order, from first to last.

Accepted Answer

Examine the routing table for the destination prefix. The correct order begins by identifying the routing table entries to see which routes are preferred, then checking the AD values of the competing protocols, verifying the configuration of the protocol with the lower AD, adjusting the AD on the desired protocol to make it preferred, and finally confirming the routing table update.