Administrative Distance practice questions

A network engineer is troubleshooting a BGP route reachability issue. R1 learns the prefix 10.1.1.0/24 via eBGP from R2 with an AD of 20, and via OSPF from R3 with an AD of 110. The engineer notices that R1 installs the OSPF route in the routing table instead of the eBGP route, even though the eBGP route is preferred by default. What is the most likely cause of this behavior?

Trap 1: The OSPF route has a lower metric than the eBGP route.

Administrative distance is compared before metric; eBGP AD 20 is lower than OSPF AD 110 regardless of metric.

Trap 2: The OSPF route is an inter-area route, which has a lower AD than…

OSPF AD is fixed at 110 for all OSPF routes unless modified; inter-area does not change AD.

Trap 3: The eBGP route is not the best path because the next-hop is…

If the next-hop were unreachable, the route would not be installed at all, but the symptom states the OSPF route is installed, not that eBGP is missing.

A
The OSPF route has a lower metric than the eBGP route.
Why wrong: Administrative distance is compared before metric; eBGP AD 20 is lower than OSPF AD 110 regardless of metric.
B
The distance bgp 20 200 200 command is configured under the BGP process, increasing the AD of eBGP routes to 200.
This command sets the AD for eBGP routes to 200, making OSPF (AD 110) preferred.
C
The OSPF route is an inter-area route, which has a lower AD than intra-area routes.
Why wrong: OSPF AD is fixed at 110 for all OSPF routes unless modified; inter-area does not change AD.
D
The eBGP route is not the best path because the next-hop is unreachable.
Why wrong: If the next-hop were unreachable, the route would not be installed at all, but the symptom states the OSPF route is installed, not that eBGP is missing.

Question 2hardmultiple choice

An engineer is troubleshooting a network where R1 and R2 are running EIGRP, and R2 redistributes a static route for 192.168.1.0/24 into EIGRP. R1 also learns the same prefix via OSPF from R3 with an AD of 110. The engineer observes that R1 prefers the EIGRP external route (AD 170) over the OSPF route. What configuration change would cause this behavior?

Trap 1: The OSPF route is a type 5 LSA, which has a higher AD than type 3…

OSPF AD is 110 for all OSPF routes regardless of LSA type, unless modified.

Trap 2: The OSPF route has a metric of 20, while the EIGRP route has a…

Administrative distance is compared before metric; OSPF AD 110 is lower than EIGRP external AD 170, so metric is irrelevant unless ADs are equal.

Trap 3: The static route was redistributed with a route-map that sets the…

Changing the metric does not affect AD; the EIGRP external route still has AD 170, so OSPF would still be preferred.

A
The OSPF route is a type 5 LSA, which has a higher AD than type 3 LSAs.
Why wrong: OSPF AD is 110 for all OSPF routes regardless of LSA type, unless modified.
B
The engineer applied the distance eigrp 90 100 command under EIGRP, lowering the AD for external routes to 100.
This sets the AD for EIGRP internal routes to 90 and external to 100, making the external route (AD 100) preferred over OSPF (AD 110).
C
The OSPF route has a metric of 20, while the EIGRP route has a metric of 2560.
Why wrong: Administrative distance is compared before metric; OSPF AD 110 is lower than EIGRP external AD 170, so metric is irrelevant unless ADs are equal.
D
The static route was redistributed with a route-map that sets the EIGRP metric to 1.
Why wrong: Changing the metric does not affect AD; the EIGRP external route still has AD 170, so OSPF would still be preferred.

Review the full routing breakdown →

Question 3easymultiple choice

A network engineer is troubleshooting a connectivity issue between two sites. R1 learns the prefix 10.0.0.0/8 via RIP (AD 120) from R2, and also via a directly connected interface on R3. The engineer notices that R1 uses the RIP route instead of the connected route. What is the most likely cause?

Trap 1: The connected interface on R3 has a higher metric than the RIP…

Connected routes have AD 0, so they are always preferred regardless of metric.

Trap 2: The distance rip 0 command was applied under RIP, making RIP routes…

If RIP AD were set to 0, it would tie with the connected route, but the router would still prefer the connected route due to route type preference (connected is directly attached).

Trap 3: The connected interface is administratively down.

If the interface is down, the connected route is removed, so RIP would be the only route, but the question states the connected route is learned from R3, implying it exists.

A
The connected interface on R3 has a higher metric than the RIP route.
Why wrong: Connected routes have AD 0, so they are always preferred regardless of metric.
B
The RIP route has an AD of 120, but the connected route is for a different subnet mask.
If the connected route is for 10.0.0.0/16 and the RIP route is for 10.0.0.0/8, they are different prefixes; the router will use the most specific match, but if the connected route is not for the exact prefix, RIP may be the only route.
C
The distance rip 0 command was applied under RIP, making RIP routes have AD 0.
Why wrong: If RIP AD were set to 0, it would tie with the connected route, but the router would still prefer the connected route due to route type preference (connected is directly attached).
D
The connected interface is administratively down.
Why wrong: If the interface is down, the connected route is removed, so RIP would be the only route, but the question states the connected route is learned from R3, implying it exists.

Question 4mediummultiple choice

An engineer is troubleshooting a routing loop between two routers. R1 and R2 are running both OSPF and EIGRP. R1 learns the prefix 172.16.1.0/24 via OSPF with AD 110 and via EIGRP internal with AD 90. The engineer notices that R1 installs the EIGRP route, but traffic to 172.16.1.0/24 is being dropped. What is the most likely issue?

Trap 1: The OSPF route has a better metric, but the EIGRP route is…

This is expected behavior; AD is compared first, so EIGRP is preferred. The issue is not about metric.

Trap 2: The OSPF route has a higher AD because it is a type 5 LSA.

OSPF AD is 110 for all routes; type 5 does not change AD.

Trap 3: The EIGRP route is an external route with AD 170.

The question states it is an internal route with AD 90, so this is not applicable.

A
The OSPF route has a better metric, but the EIGRP route is preferred due to lower AD.
Why wrong: This is expected behavior; AD is compared first, so EIGRP is preferred. The issue is not about metric.
B
The EIGRP route is a summary route pointing to a null0 interface.
If R1 has an EIGRP summary route for 172.16.1.0/24 pointing to Null0, it will be installed with AD 90 and drop traffic, causing a black hole.
C
The OSPF route has a higher AD because it is a type 5 LSA.
Why wrong: OSPF AD is 110 for all routes; type 5 does not change AD.
D
The EIGRP route is an external route with AD 170.
Why wrong: The question states it is an internal route with AD 90, so this is not applicable.

Open the full BGP breakdown →

Question 5hardmultiple choice

A network engineer is troubleshooting a multi-homed BGP setup. R1 receives the prefix 10.1.1.0/24 from two eBGP peers: R2 (AS 100) and R3 (AS 200). The engineer configures the distance bgp 20 20 20 command on R1 to make all BGP routes have the same AD. However, R1 still prefers the route from R2 over R3. What is the most likely reason?

Trap 1: The route from R2 has a lower MED than the route from R3.

MED is compared after local preference and AS path; if all are equal, MED could be a factor, but the question implies a more fundamental attribute is different.

Trap 2: The route from R2 is the oldest BGP route.

The oldest route is a tie-breaker only if all other attributes are equal; local preference is compared first.

Trap 3: The AS path for the route from R2 is shorter than that from R3.

AS path length is compared after local preference; if local preference differs, AS path is not considered.

A
The route from R2 has a lower MED than the route from R3.
Why wrong: MED is compared after local preference and AS path; if all are equal, MED could be a factor, but the question implies a more fundamental attribute is different.
B
The route from R2 has a higher local preference than the route from R3.
Local preference is compared before AS path and MED; if R2's route has a higher local preference (e.g., 150 vs 100), it will be preferred even with equal AD.
C
The route from R2 is the oldest BGP route.
Why wrong: The oldest route is a tie-breaker only if all other attributes are equal; local preference is compared first.
D
The AS path for the route from R2 is shorter than that from R3.
Why wrong: AS path length is compared after local preference; if local preference differs, AS path is not considered.

Question 6mediummultiple choice

An engineer is troubleshooting a route redistribution issue between OSPF and EIGRP. R1 runs both protocols and redistributes OSPF into EIGRP. The engineer notices that OSPF routes redistributed into EIGRP have an AD of 170, but some routes from OSPF are not being redistributed. What is the most likely cause?

Trap 1: The OSPF routes have a higher metric than the EIGRP routes.

Metric does not affect redistribution; only the presence of the route in the routing table matters.

Trap 2: The redistribute ospf 1 metric 10000 command is missing.

A missing metric can cause redistribution to fail, but the question states some routes are redistributed, so the command is present.

Trap 3: The OSPF routes are external type 2, which are not redistributed by…

OSPF external routes are redistributed by default; there is no restriction based on type.

A
The OSPF routes have a higher metric than the EIGRP routes.
Why wrong: Metric does not affect redistribution; only the presence of the route in the routing table matters.
B
The OSPF routes are not in the routing table because they are overridden by a static route with AD 1.
If a static route with AD 1 exists for the same prefix, the OSPF route will not be installed, and redistribution will not include it.
C
The redistribute ospf 1 metric 10000 command is missing.
Why wrong: A missing metric can cause redistribution to fail, but the question states some routes are redistributed, so the command is present.
D
The OSPF routes are external type 2, which are not redistributed by default.
Why wrong: OSPF external routes are redistributed by default; there is no restriction based on type.

Question 7hardmultiple choice

A network engineer is troubleshooting a situation where R1 has two routes to 10.0.0.0/8: one via OSPF (AD 110) and one via RIP (AD 120). The engineer wants R1 to prefer the RIP route. After configuring the distance 80 0.0.0.0 255.255.255.255 under the RIP process, the RIP route is still not preferred. What is the most likely reason?

Trap 1: The OSPF route has an AD of 110, but the RIP route's AD was set to…

The command uses an access-list; if the ACL does not match the prefix, the AD will not be applied.

Trap 2: The RIP route is not in the routing table because it is suppressed…

If the route were suppressed, it would not be in the routing table at all, but the question implies both routes are present.

Trap 3: The distance command under RIP only affects internal RIP routes,…

The distance command affects all RIP routes unless specified otherwise.

A
The OSPF route has an AD of 110, but the RIP route's AD was set to 80, so RIP should be preferred. The issue is that the distance command was applied to the wrong prefix.
Why wrong: The command uses an access-list; if the ACL does not match the prefix, the AD will not be applied.
B
The OSPF process has the distance ospf external 70 command configured, lowering the AD of OSPF external routes to 70.
If OSPF AD is lowered to 70, it will still be preferred over RIP with AD 80.
C
The RIP route is not in the routing table because it is suppressed by a distribute-list.
Why wrong: If the route were suppressed, it would not be in the routing table at all, but the question implies both routes are present.
D
The distance command under RIP only affects internal RIP routes, not redistributed routes.
Why wrong: The distance command affects all RIP routes unless specified otherwise.

Question 8mediummultiple choice

An engineer is troubleshooting a network where R1 and R2 are running iBGP, and R1 learns the prefix 192.168.1.0/24 from R2 with an AD of 200. R1 also learns the same prefix via OSPF from R3 with AD 110. The engineer notices that R1 uses the iBGP route. What configuration change would cause this?

Trap 1: The engineer applied the distance bgp 20 200 200 command, which…

This command sets eBGP to 20, iBGP to 200, and local to 200; iBGP remains 200, so OSPF would still be preferred.

Trap 2: The OSPF route is a type 5 LSA, which has a higher AD than type 3…

OSPF AD is 110 for all routes; type does not affect AD.

A
The engineer applied the distance bgp 20 200 200 command, which lowers eBGP AD but not iBGP.
Why wrong: This command sets eBGP to 20, iBGP to 200, and local to 200; iBGP remains 200, so OSPF would still be preferred.
B
The engineer applied the distance 150 0.0.0.0 255.255.255.255 under the OSPF process, raising OSPF AD to 150.
If OSPF AD is raised to 150, iBGP with AD 200 is still higher, but if OSPF AD is raised above 200, iBGP would be preferred. However, raising OSPF to 150 still leaves OSPF preferred. To make iBGP preferred, OSPF AD must be >200 or iBGP AD lowered. This option is plausible if the engineer raised OSPF AD to 250, but the text says 150, so it's incorrect. Let me adjust: The correct answer should be that the iBGP AD was lowered to 100 via distance bgp 20 100 200.
C
The engineer applied the distance bgp 20 100 200 command, lowering iBGP AD to 100.
This sets iBGP AD to 100, which is lower than OSPF's 110, so iBGP is preferred.
D
The OSPF route is a type 5 LSA, which has a higher AD than type 3 LSAs.
Why wrong: OSPF AD is 110 for all routes; type does not affect AD.

Question 9hardmultiple choice

A network engineer is troubleshooting a route selection issue between two routing protocols. R1 learns the prefix 10.0.0.0/8 via both IS-IS (AD 115) and OSPF (AD 110). The engineer wants R1 to prefer the IS-IS route. After configuring the distance 105 ip 10.0.0.0 0.255.255.255 under the IS-IS process, the IS-IS route is still not preferred. What is the most likely cause?

Trap 1: The OSPF route has a lower metric than the IS-IS route.

AD is compared before metric; if IS-IS AD is 105 and OSPF is 110, IS-IS is preferred regardless of metric.

Trap 2: The distance command was applied under the OSPF process instead of…

This would affect OSPF, not IS-IS, but the question states it was applied under IS-IS.

Trap 3: The IS-IS route is redistributed from another protocol, so it has a…

Redistributed routes in IS-IS have AD 115 by default, but the distance command should still override it.

A
The IS-IS route is a level 2 route, which has a default AD of 115, but the distance command only affects level 1 routes.
In IS-IS, the distance command can be applied to level 1 or level 2 routes separately; if the command only affects level 1 and the route is level 2, the AD remains 115.
B
The OSPF route has a lower metric than the IS-IS route.
Why wrong: AD is compared before metric; if IS-IS AD is 105 and OSPF is 110, IS-IS is preferred regardless of metric.
C
The distance command was applied under the OSPF process instead of IS-IS.
Why wrong: This would affect OSPF, not IS-IS, but the question states it was applied under IS-IS.
D
The IS-IS route is redistributed from another protocol, so it has a higher default AD of 115.
Why wrong: Redistributed routes in IS-IS have AD 115 by default, but the distance command should still override it.

Question 10mediummultiple choice

A network engineer runs the following command on Router R1:

R1# show ip route 10.1.1.0

Routing entry for 10.1.1.0/24 Known via "eigrp 100", distance 170, metric 30720 Redistributing via eigrp 100 Last update from 192.168.1.2 on GigabitEthernet0/0, 00:00:05 ago Routing Descriptor Blocks:

* 192.168.1.2, from 192.168.1.2, 00:00:05 ago, via GigabitEthernet0/0

Route metric is 30720, traffic share count is 1

Based on this output, which statement is correct?

Trap 1: The route 10.1.1.0/24 is an EIGRP internal route.

The administrative distance of 170 indicates an external route, not internal. Internal EIGRP routes have a default distance of 90.

Trap 2: The route 10.1.1.0/24 is learned via OSPF and redistributed into…

The output shows the route is known via EIGRP, not OSPF. The distance is EIGRP external, but the source protocol is not indicated.

Trap 3: The administrative distance of 170 is non-default and must have…

170 is the default administrative distance for EIGRP external routes, not a manual configuration.

A
The route 10.1.1.0/24 is an EIGRP internal route.
Why wrong: The administrative distance of 170 indicates an external route, not internal. Internal EIGRP routes have a default distance of 90.
B
The route 10.1.1.0/24 is an EIGRP external route, likely redistributed.
The administrative distance of 170 is the default for EIGRP external routes, confirming redistribution.
C
The route 10.1.1.0/24 is learned via OSPF and redistributed into EIGRP.
Why wrong: The output shows the route is known via EIGRP, not OSPF. The distance is EIGRP external, but the source protocol is not indicated.
D
The administrative distance of 170 is non-default and must have been manually configured.
Why wrong: 170 is the default administrative distance for EIGRP external routes, not a manual configuration.

Question 11mediummultiple choice

A network engineer runs the following command on Router R2:

R2# show ip route 192.168.10.0

Routing entry for 192.168.10.0/24 Known via "ospf 1", distance 110, metric 20 Redistributing via ospf 1 Last update from 10.0.0.1 on GigabitEthernet0/1, 00:00:10 ago Routing Descriptor Blocks:

* 10.0.0.1, from 10.0.0.1, 00:00:10 ago, via GigabitEthernet0/1

Route metric is 20, traffic share count is 1

Based on this output, what is the most likely origin of this route?

Trap 1: The route is an OSPF intra-area route.

Intra-area routes have a metric based on cost, not a fixed value like 20. The metric 20 is typical for external routes.

Trap 2: The route is an OSPF inter-area route.

Inter-area routes have a metric that reflects the area border router's cost, not a fixed 20.

Trap 3: The route is an OSPF NSSA external route.

NSSA external routes have a metric that is not necessarily 20, and they are type N1 or N2. The output does not show NSSA-specific flags.

A
The route is an OSPF intra-area route.
Why wrong: Intra-area routes have a metric based on cost, not a fixed value like 20. The metric 20 is typical for external routes.
B
The route is an OSPF inter-area route.
Why wrong: Inter-area routes have a metric that reflects the area border router's cost, not a fixed 20.
C
The route is an OSPF external route, likely redistributed.
The metric of 20 is the default for OSPF external type 2 routes, indicating redistribution.
D
The route is an OSPF NSSA external route.
Why wrong: NSSA external routes have a metric that is not necessarily 20, and they are type N1 or N2. The output does not show NSSA-specific flags.

Open the full BGP breakdown →

Question 12mediummultiple choice

A network engineer runs the following command on Router R3:

R3# show ip route 172.16.1.0

Routing entry for 172.16.1.0/24 Known via "bgp 65000", distance 20, metric 0 Redistributing via bgp 65000 Last update from 192.168.1.1 00:00:15 ago Routing Descriptor Blocks:

* 192.168.1.1, from 192.168.1.1, 00:00:15 ago

Route metric is 0, traffic share count is 1

Based on this output, what can be concluded about the administrative distance?

Trap 1: The route is an iBGP route with a manually configured distance of…

The default distance for iBGP is 200, not 20. A distance of 20 indicates eBGP, not iBGP.

Trap 2: The route is redistributed from OSPF into BGP.

The output shows the route is known via BGP, not OSPF. The source protocol is BGP.

Trap 3: The administrative distance of 20 is non-standard and must have…

20 is the standard default distance for eBGP routes, not a non-standard change.

A
The route is an iBGP route with a manually configured distance of 20.
Why wrong: The default distance for iBGP is 200, not 20. A distance of 20 indicates eBGP, not iBGP.
B
The route is an eBGP route, as the distance 20 is the default for eBGP.
eBGP routes have a default administrative distance of 20, matching this output.
C
The route is redistributed from OSPF into BGP.
Why wrong: The output shows the route is known via BGP, not OSPF. The source protocol is BGP.
D
The administrative distance of 20 is non-standard and must have been changed.
Why wrong: 20 is the standard default distance for eBGP routes, not a non-standard change.

Question 13easymultiple choice

A network engineer runs the following command on Router R4:

R4# show ip route 10.10.10.0

Routing entry for 10.10.10.0/24 Known via "connected", distance 0, metric 0 (connected) Redistributing via eigrp 100 Last update from 10.10.10.1 on GigabitEthernet0/0, 00:00:00 ago Routing Descriptor Blocks:

* 10.10.10.1, via GigabitEthernet0/0

Route metric is 0, traffic share count is 1

Based on this output, which statement is true?

Trap 1: The route is a static route with distance 0.

Static routes have a default distance of 1, not 0. Distance 0 is for connected routes.

Trap 2: The route is redistributed from EIGRP into connected.

Redistribution does not change the route type to connected. The route is directly connected.

Trap 3: The administrative distance of 0 indicates a floating static route.

Floating static routes have a higher distance, typically greater than the dynamic protocol, not 0.

A
The route is a static route with distance 0.
Why wrong: Static routes have a default distance of 1, not 0. Distance 0 is for connected routes.
B
The route is a connected route, as indicated by distance 0.
Connected routes have an administrative distance of 0, confirming this is a directly connected network.
C
The route is redistributed from EIGRP into connected.
Why wrong: Redistribution does not change the route type to connected. The route is directly connected.
D
The administrative distance of 0 indicates a floating static route.
Why wrong: Floating static routes have a higher distance, typically greater than the dynamic protocol, not 0.

Question 14mediummultiple choice

A network engineer runs the following command on Router R5:

R5# show ip route 192.168.100.0

Routing entry for 192.168.100.0/24 Known via "static", distance 1, metric 0 Redistributing via ospf 1 Last update from 10.0.0.2 on GigabitEthernet0/1, 00:00:05 ago Routing Descriptor Blocks:

* 10.0.0.2, via GigabitEthernet0/1

Route metric is 0, traffic share count is 1

Based on this output, what is the likely issue if this route is not being preferred over an EIGRP route with distance 90?

Trap 1: The static route is not preferred because its distance is higher…

The static route has distance 1, which is lower than 90, so it should be preferred. The issue is likely a misconfiguration.

Trap 2: EIGRP always has a lower administrative distance than static routes.

EIGRP internal distance is 90, which is higher than the static default of 1, so EIGRP is not always lower.

Trap 3: The static route is redistributed into OSPF, which changes its…

Redistribution does not change the administrative distance of the route in the routing table; it remains the same.

A
The static route is not preferred because its distance is higher than EIGRP's default distance of 90.
Why wrong: The static route has distance 1, which is lower than 90, so it should be preferred. The issue is likely a misconfiguration.
B
The static route may have been configured with a higher distance as a floating static route.
If the static route is not preferred, it might have a manually configured distance greater than 90, making it a floating static route.
C
EIGRP always has a lower administrative distance than static routes.
Why wrong: EIGRP internal distance is 90, which is higher than the static default of 1, so EIGRP is not always lower.
D
The static route is redistributed into OSPF, which changes its distance.
Why wrong: Redistribution does not change the administrative distance of the route in the routing table; it remains the same.

Question 15easymultiple choice

A network engineer runs the following command on Router R6:

R6# show ip route 10.0.0.0

Routing entry for 10.0.0.0/8 Known via "eigrp 100", distance 90, metric 28160 Redistributing via eigrp 100 Last update from 192.168.1.1 on GigabitEthernet0/0, 00:00:10 ago Routing Descriptor Blocks:

* 192.168.1.1, from 192.168.1.1, 00:00:10 ago, via GigabitEthernet0/0

Route metric is 28160, traffic share count is 1

Additionally, an OSPF route for the same prefix is learned with distance 110. Which route will be installed in the routing table?

Trap 1: The OSPF route will be installed because it has a lower metric.

Administrative distance is considered before metric. EIGRP has a lower distance (90) than OSPF (110), so EIGRP is preferred regardless of metric.

Trap 2: Both routes will be installed for load balancing.

Only the route with the lowest administrative distance is installed. Load balancing requires equal distance and metric.

Trap 3: Neither route will be installed due to a conflict.

One route will be installed based on the lowest administrative distance.

A
The OSPF route will be installed because it has a lower metric.
Why wrong: Administrative distance is considered before metric. EIGRP has a lower distance (90) than OSPF (110), so EIGRP is preferred regardless of metric.
B
The EIGRP route will be installed because it has a lower administrative distance.
EIGRP's distance of 90 is lower than OSPF's 110, so the EIGRP route is preferred.
C
Both routes will be installed for load balancing.
Why wrong: Only the route with the lowest administrative distance is installed. Load balancing requires equal distance and metric.
D
Neither route will be installed due to a conflict.
Why wrong: One route will be installed based on the lowest administrative distance.

Open the full BGP breakdown →

Question 16mediummultiple choice

A network engineer runs the following command on Router R7:

R7# show ip route 172.16.0.0

Routing entry for 172.16.0.0/16 Known via "bgp 65000", distance 200, metric 0 Redistributing via bgp 65000 Last update from 10.0.0.1 00:00:20 ago Routing Descriptor Blocks:

* 10.0.0.1, from 10.0.0.1, 00:00:20 ago

Route metric is 0, traffic share count is 1

Based on this output, what type of BGP route is this?

Trap 1: This is an eBGP route because the distance is 200.

eBGP has a default distance of 20, not 200. A distance of 200 indicates iBGP.

Trap 2: This is a redistributed route from OSPF into BGP.

The output shows the route is known via BGP, not OSPF. The distance indicates iBGP.

Trap 3: The distance of 200 is non-default and manually configured.

200 is the default distance for iBGP, not a manual configuration.

A
This is an eBGP route because the distance is 200.
Why wrong: eBGP has a default distance of 20, not 200. A distance of 200 indicates iBGP.
B
This is an iBGP route because the distance is 200.
iBGP routes have a default administrative distance of 200, matching this output.
C
This is a redistributed route from OSPF into BGP.
Why wrong: The output shows the route is known via BGP, not OSPF. The distance indicates iBGP.
D
The distance of 200 is non-default and manually configured.
Why wrong: 200 is the default distance for iBGP, not a manual configuration.

Question 17hardmultiple choice

A network engineer runs the following command on Router R8:

R8# show ip route 10.2.2.0

Routing entry for 10.2.2.0/24 Known via "eigrp 100", distance 90, metric 28160 Redistributing via eigrp 100 Last update from 192.168.2.1 on GigabitEthernet0/0, 00:00:05 ago Routing Descriptor Blocks:

* 192.168.2.1, from 192.168.2.1, 00:00:05 ago, via GigabitEthernet0/0

Route metric is 28160, traffic share count is 1

R8 also has a static route to 10.2.2.0/24 with next-hop 192.168.3.1 configured with distance 95. Which route will be used?

Trap 1: The static route will be used because it is manually configured.

Administrative distance determines preference. The static route has a higher distance (95) than EIGRP (90), so EIGRP is preferred.

Trap 2: Both routes will be used for load balancing.

Load balancing requires equal administrative distance and metric. The distances differ (90 vs 95).

Trap 3: Neither route will be used due to a routing loop.

The EIGRP route will be installed and used.

A
The static route will be used because it is manually configured.
Why wrong: Administrative distance determines preference. The static route has a higher distance (95) than EIGRP (90), so EIGRP is preferred.
B
The EIGRP route will be used because it has a lower administrative distance.
EIGRP's distance of 90 is lower than the static route's 95, so EIGRP is preferred.
C
Both routes will be used for load balancing.
Why wrong: Load balancing requires equal administrative distance and metric. The distances differ (90 vs 95).
D
Neither route will be used due to a routing loop.
Why wrong: The EIGRP route will be installed and used.

Question 18easymultiple choice

A network engineer runs the following command on Router R9:

R9# show ip route 192.168.50.0

Routing entry for 192.168.50.0/24 Known via "ospf 1", distance 110, metric 20 Redistributing via ospf 1 Last update from 10.0.0.1 on GigabitEthernet0/0, 00:00:10 ago Routing Descriptor Blocks:

* 10.0.0.1, from 10.0.0.1, 00:00:10 ago, via GigabitEthernet0/0

Route metric is 20, traffic share count is 1

R9 also has an EIGRP route for the same prefix with distance 90 and metric 28160. Which route will be installed?

Trap 1: The OSPF route will be installed because it has a lower metric.

Administrative distance is considered before metric. EIGRP has a lower distance (90) than OSPF (110), so EIGRP is preferred.

Trap 2: Both routes will be installed for load balancing.

Load balancing requires equal administrative distance. The distances differ (90 vs 110).

Trap 3: Neither route will be installed due to a conflict.

The EIGRP route will be installed.

A
The OSPF route will be installed because it has a lower metric.
Why wrong: Administrative distance is considered before metric. EIGRP has a lower distance (90) than OSPF (110), so EIGRP is preferred.
B
The EIGRP route will be installed because it has a lower administrative distance.
EIGRP's distance of 90 is lower than OSPF's 110, so the EIGRP route is preferred.
C
Both routes will be installed for load balancing.
Why wrong: Load balancing requires equal administrative distance. The distances differ (90 vs 110).
D
Neither route will be installed due to a conflict.
Why wrong: The EIGRP route will be installed.

Question 19mediummultiple choice

Consider the following partial configuration on a Cisco IOS-XE router: ```

router eigrp 100
 network 10.0.0.0

distance eigrp 90 170 ``` What is the effect of the `distance eigrp 90 170` command?

Trap 1: It sets the administrative distance for all EIGRP routes to 90.

The command has two parameters: internal and external distances.

Trap 2: It sets the administrative distance for EIGRP routes to 170 for all…

This command does not filter by neighbor AS.

Trap 3: It sets the metric weights for EIGRP to 90 and 170.

The `distance eigrp` command does not affect metric weights.

A
It sets the administrative distance for all EIGRP routes to 90.
Why wrong: The command has two parameters: internal and external distances.
B
It sets the administrative distance for EIGRP internal routes to 90 and external routes to 170.
The syntax is `distance eigrp <internal-distance> <external-distance>`.
C
It sets the administrative distance for EIGRP routes to 170 for all routes learned from neighbors with an AS of 100.
Why wrong: This command does not filter by neighbor AS.
D
It sets the metric weights for EIGRP to 90 and 170.
Why wrong: The `distance eigrp` command does not affect metric weights.

Question 20mediummultiple choice

Given the following configuration on a router: ```

router ospf 1

distance 150 ``` What is the effect of this configuration?

Trap 1: It sets the administrative distance for OSPF routes to 150, but…

The `distance` command applies to all OSPF routes unless further qualified.

Trap 2: It sets the administrative distance for OSPF external routes to 150.

The command without qualification applies to all OSPF routes.

Trap 3: It sets the administrative distance for OSPF routes to 150, but…

No neighbor-specific qualifier is used.

A
It sets the administrative distance for OSPF routes to 150, but only for intra-area routes.
Why wrong: The `distance` command applies to all OSPF routes unless further qualified.
B
It sets the administrative distance for OSPF routes to 150, overriding the default of 110.
The default AD for OSPF is 110; this command changes it to 150.
C
It sets the administrative distance for OSPF external routes to 150.
Why wrong: The command without qualification applies to all OSPF routes.
D
It sets the administrative distance for OSPF routes to 150, but only for routes learned from a specific neighbor.
Why wrong: No neighbor-specific qualifier is used.