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Question 370
A router receives a packet for 198.51.100.9 and has neither a matching network route nor a default route. What is the correct forwarding disposition?
- ARP for the remote destination on all links
- Forward it through the numerically lowest IP interface
- Drop the packet and send an unreachable indication when appropriate
- Flood the packet from every Ethernet interface
Explanation
Correct Answer
C:Without an installed matching route, the router has no next hop for ordinary IP forwarding.
Incorrect Answers
A:ARP resolves local-link adjacencies and cannot discover routes to arbitrary remote networks.
B:Interface address ordering does not select a default path when no route exists.
D:Layer 3 forwarding does not use Ethernet-style flooding for unknown IP destinations.
Question 371
A router has a Null0 summary for 10.9.0.0/16, plus a valid installed 10.9.5.0/24 route toward a branch. Where does traffic to 10.9.5.7 go?
- Null0 because a discard route is always preferred
- The gateway of last resort
- All interfaces because the /16 is summarized
- Toward the real /24 branch route
Explanation
Correct Answer
D:Longest-prefix lookup chooses the installed /24, while the less-specific Null0 summary can discard unmatched addresses within /16.
Incorrect Answers
A:Null0 is not inherently preferred over a more-specific installed matching route.
B:A matching /24 is more specific than any default /0 route.
C:A summary prefix does not instruct the router to broadcast an IP packet.
Question 372
R1 installs a static host route 203.0.113.18/32 toward a maintenance circuit and learns a 203.0.113.0/24 through OSPF. Which route forwards packets specifically to .18?
- The /32 host route
- Whichever route has the lower neighbor MAC address
- The OSPF /24 because it covers more hosts
- The configured default route
Explanation
Correct Answer
A:A /32 exact destination match is more specific than the covering /24; installation of both is assumed.
Incorrect Answers
B:Ethernet MAC ordering does not decide between installed IPv4 route prefixes.
C:Broader coverage does not outrank a matching host route.
D:An installed matching /32 precedes a default /0 lookup.
Question 373
Two static routes to the exact prefix 10.44.0.0/16 use different next hops and administrative distances 1 and 250. Both are reachable. Which is active normally?
- The static route with AD 250
- Neither unless OSPF advertises the prefix
- The static route with AD 1
- Both simultaneously because they are static
Explanation
Correct Answer
C:For the same prefix, the lower-distance eligible static candidate is preferred; AD 250 can remain as fallback.
Incorrect Answers
A:A higher administrative distance is intentionally less preferred for equivalent prefixes.
B:A valid static route does not need OSPF advertisement to be installed.
D:Different static administrative distances prevent these from being equal-priority paths.
Question 374
A static route to 172.31.80.0/20 lists 10.1.2.2 as next hop. That address is reachable through connected GigabitEthernet0/1. Which condition makes the path usable?
- The /20 prefix must be converted into a default route
- Recursive lookup resolves 10.1.2.2 to GigabitEthernet0/1
- The route automatically goes out all interfaces
- The destination network must first be present in ARP
Explanation
Correct Answer
B:A next-hop route is resolved through another installed route or connected interface to a real egress adjacency.
Incorrect Answers
A:Destination prefix and recursive next-hop resolution are separate concerns.
C:The router needs a specific resolved egress interface, not all links.
D:ARP is for local-link next-hop resolution, not storing remote destination subnet prefixes.
Question 375
The installed table has 172.16.32.0/19 via X and 172.16.64.0/18 via Y, with a default via Z. Which next hop is used for 172.16.50.7?
- No route because neither prefix is a /24
- Y, the 172.16.64.0/18 route
- X, the 172.16.32.0/19 route
- Z, the default /0 route
Explanation
Correct Answer
C:A /19 from third octet 32 covers .32–.63; the /18 beginning at 64 does not match .50.
Incorrect Answers
A:IP forwarding accepts any valid matching CIDR prefix length, not only /24.
B:The 64–127 third-octet range excludes destination 50.
D:The specific .32/19 prefix is already installed and matches this destination.
Question 376
The FIB holds a host route 192.0.2.25/32 via next hop A and network route 192.0.2.0/24 via B. A packet is addressed exactly to 192.0.2.25. Which route-selection rule chooses the host exception?
- Choose the /24 merely because next hop B has a lower protocol metric
- Choose the route with the lower administrative distance across these different prefix lengths
- Use the default route because it is the gateway of last resort
- Select the longest matching prefix
Explanation
Correct Answer
D:A /32 route matches one specific IPv4 destination, while the /24 parent covers many addresses. Longest-prefix match selects the /32 for that host even if the broader route has a different administrative distance.
Incorrect Answers
A:The /32 and /24 are distinct installed prefixes and the /32 is the longest match for .25 regardless of per-source costs.
B:AD selects among competing sources for an identical prefix; it does not override a more-specific installed /32.
C:The destination matches two installed routes, including an exact /32; default fallback is unnecessary.
Question 377
A router receives a packet destined to 198.51.100.50. Its installed FIB contains 198.51.100.0/24 via A and a default 0.0.0.0/0 via B; both resolve. Which **actual installed entry** forwards this packet?
- Use the installed 198.51.100.0/24 route via A
- Use the installed 0.0.0.0/0 route via B
- Discard the packet despite both matching installed routes
- Use a nonexistent 198.51.100.50/32 host route via C
Explanation
Correct Answer
A:198.51.100.50 is inside the /24, whose 24-bit prefix is longer than the default /0, so the FIB selects the /24 route via A.
Incorrect Answers
B:The default also matches but loses to a valid installed /24 route because zero prefix bits are less specific.
C:Forwarding does not discard packets when a valid, resolved more-specific matching route is installed.
D:No /32 route is installed in the stated FIB; a hypothetical host exception cannot outrank the actual /24 entry.
Question 378
EIGRP and OSPF both offer 10.20.30.0/24 with reachable next hops and AD 90/110. Which installation criterion chooses the RIB candidate **before** packets are forwarded?
- Choose OSPF because its metric is numerically smaller than an EIGRP composite metric
- Select the source with lower administrative distance
- Select a route by longest-prefix match even though both advertise exactly /24
- Choose the routing source whose next-hop address is numerically smaller
Explanation
Correct Answer
B:Administrative distance decides which route source installs for an identical prefix.
Incorrect Answers
A:Metrics from different protocols are not directly comparable for installing an identical prefix; AD 90 versus 110 decides source preference.
C:The prefix lengths are identical so longest-prefix selection cannot distinguish the two candidates at RIB install.
D:Next-hop IPv4 numeric ordering is not the Cisco installation rule when route-source distances differ.
Question 379
An OSPFv2 router has two paths to the same 10.20.30.0/24, both intra-area. Path A has local interface cost 10 plus downstream cost 5; Path B has local interface cost 2 plus downstream cost 20. Which path does the router prefer by total OSPF cost?
- Path B, because its local exit interface alone has lower cost 2
- Path A, because total OSPF cost 10 + 5 = 15 is less than 2 + 20 = 22
- Both paths equally, because administrative distance 110 is identical for OSPF
- The route with a /32 host mask, although no such route was advertised
Explanation
Correct Answer
B:For an intra-area route OSPF accumulates link costs along the path. A is 15 versus B at 22 and is preferred.
Incorrect Answers
A:The total advertised cost through B is 22; comparing only its local interface cost ignores the remaining path to the prefix.
C:Administrative distance compares routes from different sources for the same prefix; equal OSPF AD does not override unequal OSPF metrics.
D:The two given candidates advertise the same /24; a hypothetical /32 cannot be selected.
Question 380
After the router identifies the installed winning destination prefix, it needs the actual interface/adjacent router through which to transmit. Which forwarding detail determines the physical egress?
- Use the administrative distance to decide which physical Ethernet egress port must transmit
- Use the outgoing interface or resolved next hop
- Select the source prefix with the smallest IPv4 address regardless of destination
- Use the OSPF router ID as if it were the local egress interface name
Explanation
Correct Answer
B:IP forwarding transmits toward the interface selected by the installed route.
Incorrect Answers
A:AD ranked sources before installation; the installed route’s resolved egress or adjacency identifies the outgoing link.
C:The destination has already been matched; random prefix arithmetic does not indicate the resolved egress.
D:Router ID identifies an OSPF process, not the interface/next hop used for this packet.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests