CCNA IP Routing Practice Test 27 — 15 Questions

Question 1

You are configuring a Cisco router that connects to an ISP through two different providers. The primary path is learned dynamically through OSPF, and the backup path is a static route pointing to a next-hop of 203.0.113.1. You need the static route to remain in the routing table only when the OSPF-learned default route is unavailable. Which configuration should you apply?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

ip route 0.0.0.0 0.0.0.0 203.0.113.1 250. A floating static route is created by configuring a static route with an administrative distance higher than that of the dynamic routing protocol providing the primary route. OSPF's default administrative distance is 110, so a static route with a distance of 250 will not be installed while the OSPF route exists. When OSPF loses the route, the static route becomes active and provides backup connectivity.

Answer

ip route 0.0.0.0 0.0.0.0 203.0.113.1 110

Answer

ip route 0.0.0.0 0.0.0.0 203.0.113.1 90

Answer

ip route 0.0.0.0 0.0.0.0 203.0.113.1 permanent

Question 2

A network engineer is configuring a Cisco router that must forward all traffic destined to unknown networks to the next-hop 192.0.2.1. The engineer enters the command ip route 0.0.0.0 0.0.0.0 192.0.2.1. After this configuration, which routing table entry will be created?

Accepted Answer

A static route for 0.0.0.0/0 via 192.0.2.1. The command ip route 0.0.0.0 0.0.0.0 192.0.2.1 defines a default static route. The destination prefix 0.0.0.0/0 matches any IPv4 address, making it the least specific route. If no other route matches a packet's destination, this default route is used. It is a static route and appears in the routing table with a source code of S and a candidate default marker.

Answer

A static route for 0.0.0.0/32 via 192.0.2.1

Answer

A dynamic route learned via a routing protocol

Answer

A directly connected route for 192.0.2.0/24

Question 3

You are configuring a Cisco router that connects to an ISP through two different providers. The primary path is learned dynamically through OSPF, and the backup path is a static route pointing to a next-hop of 203.0.113.1. You need the static route to remain in the routing table only when the OSPF-learned default route is unavailable. Which configuration should you apply?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

ip route 0.0.0.0 0.0.0.0 203.0.113.1. A default static route is configured with the destination network 0.0.0.0 and subnet mask 0.0.0.0, followed by the next-hop IP address. This matches all packets and is the correct way to direct unknown traffic to the ISP. The other options either create a host route, point to an interface without a next-hop, or use a command that does not affect the routing table on a router.

Answer

ip route 0.0.0.0 0.0.0.0 Serial0/0/0

Answer

ip route 203.0.113.1 255.255.255.255 Serial0/0/0

Answer

ip default-gateway 203.0.113.1

Question 4

A network administrator needs to configure a static route on a Cisco router to reach the 192.168.50.0/24 network through next-hop 10.1.1.2. Which command accomplishes this?

Accepted Answer

ip route 192.168.50.0 255.255.255.0 10.1.1.2. The correct syntax for an IPv4 static route on Cisco IOS is 'ip route destination_network subnet_mask next_hop_address'. The destination network and mask must be in dotted-decimal format, and the next-hop address is the IP address of the adjacent router. This command creates a static route to 192.168.50.0/24 via 10.1.1.2.

Answer

ip route 192.168.50.0 255.255.255.0 10.1.1.2 1

Answer

ip route 192.168.50.0/24 10.1.1.2

Answer

ip route 192.168.50.0 255.255.255.0 Ethernet0/0 10.1.1.2

Question 5

A router has the following routes in its routing table: a static route to 10.1.1.0/24 with administrative distance 1, an OSPF route to 10.1.1.0/24 with administrative distance 110, and an EIGRP route to 10.1.1.0/24 with administrative distance 90. A packet arrives destined for 10.1.1.50. Which route will the router use to forward the packet?

Accepted Answer

The static route. Administrative distance is used to select the best route when multiple routing sources provide a route to the same destination. The static route has the lowest administrative distance (1), so it is preferred over EIGRP (90) and OSPF (110). The packet will be forwarded using the static route.

Answer

The EIGRP route

Answer

The OSPF route

Answer

The router will load-balance between all three routes

Question 6

A router is running OSPFv2 and has learned multiple routes to the same destination. You need to ensure that OSPF installs the route with the lowest cost into the routing table. Which two statements about OSPF path selection are true? (Choose two.)

Accepted Answer

OSPF uses cost as the metric, which is calculated based on bandwidth.. OSPF uses cost as its metric, derived from interface bandwidth, and it prefers the lowest total cost path. When multiple paths have the same cost, OSPF performs equal-cost load balancing by default. The other statements are incorrect because OSPF does not use hop count, does not prefer higher cost, and does not require manual metric configuration.

Answer

OSPF uses hop count as its metric to determine the best path.

Answer

OSPF requires manual configuration of metrics on each interface to function.

Answer

OSPF selects the path with the highest cost to avoid congestion.

Question 7

A router has learned a route to 10.10.10.0/24 from both OSPF and EIGRP. The OSPF route has a metric of 20, and the EIGRP route has a metric of 1000. Which route will be installed in the routing table, and why?

Accepted Answer

The EIGRP route, because EIGRP has a lower administrative distance (90) than OSPF (110).. When a router learns the same destination from multiple routing protocols, it uses administrative distance to select the best route. EIGRP's default administrative distance is 90, while OSPF's is 110. Because 90 is lower, the EIGRP route is installed in the routing table. Metrics are only compared between routes from the same protocol.

Answer

The OSPF route, because OSPF has a lower administrative distance (110) than EIGRP (90).

Answer

Both routes are installed, and the router performs equal-cost multipathing.

Answer

The OSPF route, because its metric of 20 is lower than EIGRP's metric of 1000.

Question 8

A network administrator is configuring OSPFv2 on a Cisco router. The router is connected to two different areas: Area 0 and Area 1. The administrator wants to summarize the routes from Area 1 into Area 0. Which two statements are true about OSPF inter-area route summarization? (Choose two.)

Accepted Answer

Summarization is configured on the ABR using the area range command.. Inter-area route summarization in OSPF is performed on an Area Border Router (ABR) using the area range command. The ABR advertises a single Type 3 summary LSA for the summarized prefix into other areas, reducing the number of LSAs and routing table entries. It does not require a stub area, and the summary-address command is for external summarization on an ASBR.

Answer

Summarization is configured using the summary-address command on the ABR.

Answer

Summarization requires the area to be a stub area.

Answer

Summarization can only be configured on an ASBR.

Question 9

You are configuring a default route on R1 to send all unknown traffic to the next-hop 203.0.113.1. However, you want this route to be used only if the primary default route learned via OSPF is unavailable. Which command should you use?

Accepted Answer

ip route 0.0.0.0 0.0.0.0 203.0.113.1 200. A floating static route is configured with an administrative distance higher than the primary route's administrative distance. OSPF has a default administrative distance of 110, so setting the static route to 200 ensures it is only used when the OSPF route is not available. This provides a backup path without interfering with normal operation.

Answer

ip route 0.0.0.0 0.0.0.0 203.0.113.1

Answer

ip route 0.0.0.0 0.0.0.0 203.0.113.1 255

Answer

ip route 0.0.0.0 0.0.0.0 203.0.113.1 110

Question 10

A network administrator is configuring a Cisco router to use OSPFv2 for IPv4 routing. The router is connected to two OSPF areas: area 0 and area 1. The administrator wants to ensure that the router becomes an Area Border Router (ABR) and that it can exchange routes between the areas. Which two statements are true about the OSPFv2 configuration and operation in this scenario? (Choose two.)

Accepted Answer

The router must have at least one interface in area 0 and one interface in area 1 to become an ABR.. To become an ABR, a router must have at least one interface in the backbone area (area 0) and at least one interface in another area. The ABR generates Type 3 Summary LSAs to advertise networks from one area into another, enabling inter-area routing. Automatic summarization is not enabled by default; it requires manual configuration. The router ID is a single identifier for the OSPF process, not per area, and adjacencies form only within the same area.

Answer

The router will automatically summarize routes between area 0 and area 1 by default.

Answer

The router will form a full adjacency with all OSPF routers in both areas regardless of area ID.

Answer

The router must be configured with the same router ID in both areas.

Question 11

A network technician is examining the routing table of a Cisco router and sees the following entry: O 10.10.10.0/24 [110/2] via 192.168.1.2, 00:00:23, GigabitEthernet0/1. What does the value 110 represent in this output?

Accepted Answer

The administrative distance of the route. In the routing table, the format is [administrative distance/metric]. For OSPF, the default administrative distance is 110, and the metric is 2. Therefore, 110 is the administrative distance, which is used to determine the trustworthiness of the routing source. The metric is used to choose the best path within the same routing protocol.

Answer

The cost of the route

Answer

The metric of the route

Answer

The hop count to the destination

Question 12

A network administrator is configuring a router to forward all unknown IPv4 traffic to the next-hop address 192.168.1.1. Which command correctly creates this default static route?

Accepted Answer

ip route 0.0.0.0 0.0.0.0 192.168.1.1. The correct command to configure an IPv4 default static route is 'ip route 0.0.0.0 0.0.0.0 192.168.1.1'. The destination 0.0.0.0 with mask 0.0.0.0 matches any IPv4 address, and the next hop is specified as 192.168.1.1. This route is used when no more specific route matches the destination. Other options either use an invalid mask, add unnecessary parameters, or have incorrect syntax.

Answer

ip route 0.0.0.0 0.0.0.0 192.168.1.1 name DEFAULT

Answer

ip route 0.0.0.0 255.255.255.255 192.168.1.1

Answer

ip route 0.0.0.0 0.0.0.0 192.168.1.1 1

Question 13

A network engineer is configuring a floating static route on a Cisco router to provide backup connectivity to a remote network 172.16.0.0/16. The primary route is learned via OSPF. The engineer wants the static route to be used only if the OSPF route is lost. Which command should be used?

Accepted Answer

ip route 172.16.0.0 255.255.0.0 192.168.1.2 200. A floating static route is a static route with a higher administrative distance than the primary route, so it remains inactive until the primary route is lost. For OSPF with a default distance of 110, the static route must have a distance greater than 110, such as 200. When the OSPF route disappears, the static route is installed and used.

Answer

ip route 172.16.0.0 255.255.0.0 192.168.1.2 110

Answer

ip route 172.16.0.0 255.255.0.0 192.168.1.2 255

Answer

ip route 172.16.0.0 255.255.0.0 192.168.1.2 90

Question 14

A router has two static routes to the same destination network: one with administrative distance 1 and another with administrative distance 200. Both routes are configured with the same next-hop address. What will the router do with these routes?

Accepted Answer

Install only the route with administrative distance 1.. When multiple static routes to the same destination exist, the router installs the one with the lowest administrative distance. Administrative distance 1 is preferred over 200, so the route with distance 1 is used. The other route acts as a backup and is only installed if the primary route becomes unavailable. Load balancing does not occur because the distances differ.

Answer

Install only the route with administrative distance 200.

Answer

Reject both routes due to a conflict.

Answer

Install both routes and load-balance traffic between them.

Question 15

A network engineer is troubleshooting a router that is not forwarding traffic to a remote network. The router has a static route configured for that network, but the next-hop address is not directly connected and is not reachable via any other route. What is the most likely cause of the problem?

Accepted Answer

The static route is not installed in the routing table because the next-hop is unreachable.. A static route with a next-hop address requires that the next-hop be reachable through a directly connected network or another route. If it is not reachable, the route is not installed in the routing table, and traffic is not forwarded. The other options are less likely because administrative distance, mask type, and IP routing are not the primary causes of this specific symptom.

Answer

The static route is configured with a wildcard mask instead of a subnet mask.

Answer

The static route has an administrative distance that is too low.

Answer

The router needs to have IP routing enabled to use static routes.