CCNA IP Routing Practice Test 14 — 15 Questions

Question 1

Based on the exhibit, which route will be used for destination 10.1.1.70?

Accepted Answer

The static route to 10.1.1.64/26. The route used will be the one with the longest matching prefix. In practical terms, 10.1.1.70 falls inside 10.1.1.64/26, and that prefix is more specific than both 10.1.1.0/24 and 10.1.0.0/16. Route selection begins with specificity, so the /26 route wins regardless of the broader alternatives.

This is a clean simulation-style routing-table interpretation question and very close to real exam thinking.

Answer

The OSPF route to 10.1.1.0/24

Answer

The OSPF route to 10.1.0.0/16

Answer

The default route

Question 2

You are verifying OSPF operation on router R1. After confirming that OSPF is configured on the correct interfaces, which command should you use next to directly check whether R1 has established a neighbor adjacency with another OSPF router?

Accepted Answer

show ip ospf neighbor. The command show ip ospf neighbor directly displays the OSPF neighbor table, showing whether an adjacency has formed, the neighbor's Router ID, and the current state (e.g., FULL). This is the quickest verification step after confirming configurations. The other commands are unrelated to OSPF: show vlan brief displays VLAN assignments, show spanning-tree shows STP topology, and show mac address-table shows the MAC address table. None of these provide any OSPF neighbor information and would only delay troubleshooting.

Answer

show vlan brief

Answer

show spanning-tree

Answer

show mac address-table

Question 3

Based on the exhibit, what is the most likely reason the PPP link is down?

Accepted Answer

The serial interfaces use different encapsulations.. The PPP link is down because the two ends are configured for different encapsulations. In practical terms, one side is using PPP and the other is using HDLC, so the devices are not speaking the same data-link protocol on the serial link. Until those encapsulations match, the link cannot come up correctly at the data-link layer.

This is a classic WAN troubleshooting pattern that fits well into simulation-style exam coverage.

Answer

PPP requires CAPWAP on both routers.

Answer

The routers must run BGP before PPP can establish.

Answer

Serial links can use only OSPF, not PPP.

Question 4

Based on the exhibit, which route will be used to reach 172.20.10.33?

Accepted Answer

The static route to 172.20.10.32/27. The route used will be the one with the longest matching prefix. In practical terms, 172.20.10.33 matches both the /24 and the /27 shown, but the /27 is more specific. That means the router selects the /27 route before considering the broader /24 or any default route.

This is exactly the kind of route-table interpretation the CCNA exam likes because it rewards precise thinking about prefix boundaries.

Answer

The OSPF route to 172.20.10.0/24

Answer

The default route

Answer

No route, because the destination does not match any prefix.

Question 5

What is the best explanation for why a router chooses the OSPF route to 10.50.0.0/16 instead of the RIP route?

Accepted Answer

Because OSPF has a lower administrative distance than RIP for the same prefix.. The router chooses the OSPF route because when the prefix length is the same, source preference is considered, and OSPF has a lower administrative distance than RIP. In practical terms, both routes describe the same destination size, so longest-prefix match does not separate them. The router then trusts the OSPF source more than RIP by default.

This is a classic administrative-distance comparison question and a very important route-selection concept.

Answer

Because RIP routes are never installed when OSPF is running.

Answer

Because OSPF always has a longer prefix than RIP.

Answer

Because the RIP metric is lower than the OSPF metric.

Question 6

R1 and R2 are connected via Ethernet and are configured with OSPF, but they fail to form an adjacency. Upon checking the interface configurations, you see that R1’s interface is in OSPF area 0 while R2’s interface is in area 1, and both interfaces use default timers and are in the same subnet. What is the most likely reason?

Accepted Answer

The OSPF areas do not match on the shared segment.. The most likely cause is an OSPF area mismatch on the shared segment. R1 and R2 are in the same IP subnet and use default hello/dead timers, so neither subnet mismatch nor timer mismatch is the problem. OSPF can run on Ethernet interfaces. However, OSPF requires neighbors on the same link to agree on the area ID; here they differ, preventing adjacency. Option B is incorrect because OSPF process IDs are locally significant and do not need to match.

Answer

The routers must use the same process ID.

Answer

The interfaces are in different IPv4 subnets.

Answer

OSPF cannot run on Ethernet interfaces.

Question 7

Based on the exhibit, why is traffic to 192.168.40.200 using the default route instead of the intended static route?

Accepted Answer

The static route next hop is unreachable or invalid for forwarding.. The intended static route is not being used because the next hop for that static route is not reachable from the current routing table. In practical terms, a route can be configured, but the router still needs a way to resolve and forward to the next-hop address. If that next hop is unreachable, the route may not be installed or usable, so traffic falls back to the default route instead.

This is a realistic troubleshooting pattern because the configuration line alone can look correct until you compare it with actual reachability.

Answer

Default routes always override static routes.

Answer

The destination must be configured as a /16, not a /24.

Answer

Static routes can be used only if OSPF is disabled.

Question 8

Based on the exhibit, what is the most likely reason the PPP link is failing to authenticate?

Accepted Answer

The PPP authentication credentials do not match between the two sides.. The most likely reason is a credentials mismatch between the two sides of the PPP authentication setup. In practical terms, PPP authentication requires the peers to agree on the relevant identity and secret information. If those values do not align, the link may come up physically but authentication fails and the logical connection does not establish properly.

This is a very exam-relevant WAN troubleshooting scenario because it focuses on a realistic failure after the transport is already present.

Answer

The interfaces must use HDLC instead of PPP before authentication can work.

Answer

CHAP requires the routers to be in different IPv4 subnets.

Answer

PPP authentication works only over GRE tunnels.

Question 9

Based on the exhibit, which command is the best next step to verify whether the floating static route becomes active after the primary route is lost?

Accepted Answer

show ip route. The best next step is to examine the routing table directly after removing or losing the primary route. In practical terms, the purpose of a floating static route is to appear when the better route disappears. The clearest way to verify that behavior is to inspect the route table for the default route after the failure condition.

This is a simulation-style verification question. It is not asking how to configure the route, but how to confirm failover actually happened.

Answer

show vlan brief

Answer

show spanning-tree

Answer

show power inline

Question 10

Why is R1 not installing the floating static default route into the routing table?

Accepted Answer

Because the OSPF default route has a lower administrative distance than the floating static route.. The floating static default route is not installed because the primary default route is already present and has a lower administrative distance. In practical terms, a floating static route is meant to sit in reserve and appear only when the preferred route is unavailable. Since the OSPF default route is active and has a better administrative distance, the backup route is not used yet.

This is a classic route-preference question. The key idea is not just that a static route exists, but that a higher-distance static route is intentionally designed to lose until the primary path disappears.

Answer

Because static default routes can never be used when OSPF is enabled.

Answer

Because the static default route must use a /24 mask instead of 0.0.0.0.

Answer

Because the next hop of a floating route must be a loopback address.

Question 11

Why is traffic to 10.10.10.200 using the EIGRP route instead of the OSPF route, given that both routes have the same prefix length?

Accepted Answer

Because EIGRP has a lower administrative distance than OSPF for the same prefix length.. When two routes have the same prefix length, the router uses administrative distance to choose the route with the lowest value. EIGRP has a default administrative distance of 90, while OSPF uses 110. Therefore, the EIGRP route is preferred.

Answer

Because OSPF routes are never installed when EIGRP is present.

Answer

Because OSPF can be used only for IPv6 routes.

Answer

Because EIGRP routes always have a smaller subnet mask than OSPF routes.

Question 12

A router has a static route configured: ip route 10.200.0.0 255.255.0.0 GigabitEthernet0/1. The output of show ip interface brief shows that interface GigabitEthernet0/1 is administratively down. Why is the route to 10.200.0.0/16 present in the running configuration but absent from the routing table?

Accepted Answer

Because the route points to an interface that is administratively down.. The static route is absent because the outgoing interface is down. In practical terms, when a static route depends on an interface that is not operational, the router cannot use that path, so the route is not installed as usable forwarding state. The configuration line alone is not enough; the forwarding path also has to be viable.

This is a realistic static-route troubleshooting pattern because it distinguishes between configured intent and operational state.

Answer

Because static routes cannot reference exit interfaces.

Answer

Because the destination must be a /24, not a /16.

Answer

Because static routes require NTP before installation.

Question 13

R1 and R2 are connected via a GigabitEthernet link in the same IPv4 subnet, and both routers have OSPF configured in the same area. However, R1 is not learning any OSPF routes from R2. What is the most likely cause?

Accepted Answer

GigabitEthernet0/0 is configured as a passive OSPF interface on R1.. The most likely reason is that one side has the interface configured as passive, which prevents OSPF hello packets from being sent on that interface. In practical terms, the network statement alone does not guarantee neighbor formation. OSPF still needs active neighbor discovery on the link. If the interface is passive, the router advertises the connected network into OSPF but does not attempt to form an adjacency there.

This is a realistic routing troubleshooting pattern because the configuration can look mostly correct until you inspect the passive-interface setting.

Answer

The routers must use different OSPF process IDs to exchange routes.

Answer

The routers are in different IPv4 subnets.

Answer

OSPF can advertise routes only across serial links.

Question 14

Based on the exhibit, why is the static route not being used for 172.18.9.10?

Accepted Answer

Because the connected /24 route is more specific than the static /16 route.. The static route is not being used because the connected route is the more specific match. In practical terms, route selection starts with prefix specificity. The static route covers a broad /16, but the destination 172.18.9.10 also falls inside a connected /24. The /24 wins because it is more specific.

This is a classic routing interpretation question because it tests whether you apply longest-prefix logic before thinking about route source preference.

Answer

Because static routes are never used when a connected network exists anywhere in the table.

Answer

Because connected routes always have administrative distance 255.

Answer

Because static routes work only for default routing.

Question 15

A router has the following routes in its routing table: a static route to 10.60.4.16/28, an OSPF route to 10.60.4.0/24, and an EIGRP route to 10.60.0.0/16. Which route will be used for a packet destined to 10.60.4.17?

Accepted Answer

The static route to 10.60.4.16/28. The route used will be the route with the longest matching prefix. In practical terms, 10.60.4.17 falls inside the /28 route shown, and that is more specific than the broader /24 and /16 alternatives. Because specificity comes first, the /28 route wins.

This is a clean route-table interpretation problem that mirrors actual exam-style thinking very closely.

Answer

The OSPF route to 10.60.4.0/24

Answer

The EIGRP route to 10.60.0.0/16

Answer

No route at all