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Cisco 200-301 Practice Test 40

Question 390

A router forwards an IPv4 packet from Ethernet VLAN 10 onto Ethernet VLAN 20. The IP destination remains the remote host, but the next hop has a new MAC address. What new link-layer encapsulation is needed?

  1. Build a new link-layer Ethernet header for the outgoing hop
  2. Retain the source and destination MACs of the inbound VLAN 10 frame
  3. Replace the destination IPv4 address with the next-hop router IP
  4. Send an 802.11 wireless association frame instead of an Ethernet frame

Explanation

Correct Answer

A:

Routers replace link-layer framing for each routed link while forwarding the IP packet.

Incorrect Answers

B:

A router forwards a new Ethernet frame on VLAN 20 with a local outgoing source MAC and next-hop/host destination MAC.

C:

Normal IP forwarding keeps the final IPv4 destination; the next hop is used for outgoing Layer 2 delivery.

D:

Both interfaces are Ethernet VLANs, so the new hop uses Ethernet L2 encapsulation rather than an unrelated Wi-Fi exchange.

Question 391

On a CEF-enabled IOS router, a transit packet destination matches several installed forwarding entries. Which step actually selects the forwarding route and next-hop rather than merely comparing configured routes?

  1. Prefer the route with the highest administrative distance, regardless of destination mask
  2. Select the shortest installed matching prefix because it covers the most addresses
  3. Choose a route only after testing whether the application-layer protocol is HTTPS
  4. Consult the active FIB for the longest matching destination prefix and its resolved adjacency

Explanation

Correct Answer

D:

CEF uses its FIB, built from selected routes, to apply longest-prefix matching to the destination address and use the appropriate adjacency for forwarding.

Incorrect Answers

A:

Administrative distance helps a router decide which comparable routes enter the routing table; a higher distance is not the preference. Packet forwarding uses the installed most-specific destination match.

B:

The shortest matching prefix is the broadest route, such as a default or aggregate. Longest-prefix matching prefers the most specific installed entry that covers the destination.

C:

Ordinary CEF destination-prefix lookup is not conditional on a packet carrying HTTPS. Application-layer inspection or policy can affect filtering but is not the requested route-selection algorithm.

Question 392

A selected IPv4 route points to 192.0.2.1 on a directly attached Ethernet network, but no MAC binding exists yet. Which neighbor/adjacency state must be resolved for forwarding?

  1. Send the Ethernet frame to the router’s own Gi0/1 MAC as its destination
  2. Consult or populate ARP adjacency
  3. Use the OSPF router-ID as an Ethernet MAC lookup key
  4. Assume the route prefix itself uniquely determines an Ethernet destination MAC

Explanation

Correct Answer

B:

ARP resolves local IPv4 neighbor reachability for Ethernet transmission.

Incorrect Answers

A:

The next-hop IP is another device, so its resolved MAC—not this router’s local interface MAC—is the destination.

C:

Routing process IDs are not ARP protocol bindings for 192.0.2.1 on the attached Ethernet link.

D:

A route entry identifies next hop/egress; ARP must resolve the adjacent IPv4 destination to a link-layer address.

Question 393

A Cisco IOS XE router owns Ethernet0/0 address 10.1.1.1/30. Its IPv4 routing table shows C 10.1.1.0/30 and L 10.1.1.1/32. An IP packet arrives with destination 10.1.1.1. What does CEF do with this most-specific local entry?

  1. It uses the local /32 receive adjacency so the router processes a packet addressed to itself
  2. It sends the packet to an adjacent router because the /30 connected route has a lower mask
  3. It discards every packet to the owned interface IP because local addresses cannot have host routes
  4. It selects the Internet default route rather than the locally installed /32 destination

Explanation

Correct Answer

A:

The local host route is a CEF receive adjacency; packets destined to this router-owned IP address are processed locally rather than forwarded as transit packets.

Incorrect Answers

B:

A connected /30 covers the interface subnet, but the more-specific local /32 identifies the destination owned by the router itself.

C:

Cisco installs local routes precisely to accept traffic addressed to locally owned interface addresses, so an unconditional discard is incorrect.

D:

A matching /32 local route is more specific than the default and prevents default-route forwarding for this local IP destination.

Question 394

A floating static 10.70.0.0/16 with AD 200 is configured, but an equivalent 10.70.0.0/16 OSPF route with AD 110 is active and both next hops are reachable. Why might the static route be absent from the installed RIB?

  1. Prefer the configured AD 200 static because static routes always beat OSPF
  2. Choose the static because it has a shorter or lower IPv4 next-hop address
  3. Compare its greater AD with a present preferred route
  4. Choose the static because a /16 always outranks an OSPF /16

Explanation

Correct Answer

C:

The higher-distance backup is not installed while a matching better route remains available.

Incorrect Answers

A:

Static routes default to AD 1, but this one explicitly has AD 200; the valid OSPF AD 110 same-prefix route wins.

B:

Next-hop address magnitude does not rank otherwise eligible route sources for one identical prefix.

D:

The prefixes are identical /16 entries, so lower administrative distance—not prefix specificity—decides the installed source.

Question 395

The route/FIB sends a packet to Gi0/1, but an outbound ACL denies the traffic. Which policy stage must be inspected separately from choosing the route?

  1. Assume an installed route guarantees forwarding regardless of output ACLs
  2. Check ACL disposition after routing context
  3. Change the source routing-protocol AD to override the egress interface ACL
  4. Use longest-prefix match again as proof that the packet is permitted

Explanation

Correct Answer

B:

A valid forwarding route does not guarantee that an ACL permits the packet.

Incorrect Answers

A:

A routing choice does not bypass an outbound ACL; packet filtering can still drop an otherwise routable packet.

C:

Administrative distance affects RIB source selection and cannot authorize packets denied by interface policy.

D:

Prefix selection chooses egress; it is separate from whether an ACL allows the traffic.

Question 396

A preferred OSPF 10.10.0.0/16 route disappears when the neighbor fails. An eligible higher-AD static route for the same prefix remains configured and resolved. Which route should then become active?

  1. Retain the withdrawn OSPF route as installed despite loss of the neighbor
  2. Prefer the static default 0/0 over the now-valid /16 floating backup
  3. Use OSPF’s lower old cost as a reason to reject the remaining static
  4. Install the remaining eligible floating static route

Explanation

Correct Answer

D:

A higher-distance static candidate becomes active after the preferred matching route is withdrawn.

Incorrect Answers

A:

The primary path no longer provides an eligible route; the backup static can become the preferred remaining same-prefix candidate.

B:

A usable /16 is more specific than the default and the backup is now eligible to install.

C:

A withdrawn OSPF path is not an eligible RIB candidate, regardless of its former metric.

Question 397

A /16 aggregate route is withdrawn during a partial link failure, but a valid installed /32 host route to one server survives. What happens to forwarding for packets destined to that exact host?

  1. Prefer the still-installed /32 route
  2. Discard packets to the host solely because the covering /16 aggregate was withdrawn
  3. Prefer a matching default /0 over the valid installed /32 for that exact destination
  4. Select the withdrawn /16 because it used to have lower administrative distance

Explanation

Correct Answer

A:

The specific /32 survives independently and matches the named host, so forwarding can continue to that host even after the broader /16 is withdrawn.

Incorrect Answers

B:

The /16 is not required for forwarding to a destination with its own still-valid installed /32 route.

C:

When both are installed and match, the /32 is longer and outranks the less-specific /0 default in packet forwarding.

D:

A withdrawn prefix cannot be selected from the active FIB, and administrative distance does not override a longer installed destination match.

Question 398

R1 has two equal-cost OSPF next hops to the same destination /24. One routed uplink fails, OSPF converges, and the failed next hop is removed from the installed forwarding set while the other remains valid. What should happen to *new* matching traffic after convergence?

  1. It can use the surviving installed next hop; the failed path must no longer be selected
  2. It must continue alternating evenly between the failed and healthy path
  3. It must be discarded even though an eligible route remains installed
  4. It must use a separate application DNS record to pick a physical uplink

Explanation

Correct Answer

A:

CEF/forwarding can select only eligible installed adjacencies; after convergence leaves one valid next hop, subsequent matching traffic follows that surviving route. Transient packet loss may occur during failure.

Incorrect Answers

B:

A failed adjacency removed from the FIB is not a valid ECMP member; retaining it indefinitely would blackhole traffic.

C:

An eligible remaining route can forward packets, so total discard is not implied by loss of one parallel uplink.

D:

IP routing and next-hop selection are network-layer decisions rather than choices made by an application DNS record.

Question 399

The FIB contains OSPF 172.16.4.0/24 and a static default. A packet for 172.16.4.32 matches both. Which installed path has the more specific destination match?

  1. Take the default because its configured AD 1 is lower than the OSPF AD 110
  2. Use the specific OSPF route
  3. Use equal-cost load balancing across the OSPF /24 and default /0
  4. Drop the packet for lack of a route to 172.16.4.32

Explanation

Correct Answer

B:

Forwarding chooses the most-specific matching destination prefix.

Incorrect Answers

A:

Among already installed prefixes /24 and /0, forwarding uses longest prefix, not AD across prefixes.

C:

ECMP applies to eligible equal-cost paths of a route, not two different prefix lengths of /24 and /0.

D:

The destination is explicitly inside the installed 172.16.4.0/24 OSPF prefix.

Question 400

A packet arrives for 203.0.113.9 and no installed route, connected network, host route or default matches that address. Which router action is appropriate instead of guessing an egress?

  1. Forward to the lowest numeric local IPv4 interface when no route exists
  2. Drop the packet and generally signal unreachable as applicable
  3. Fabricate an ARP entry for the destination to force delivery
  4. Use OSPF’s administrative distance to choose a route even though none is installed

Explanation

Correct Answer

B:

Without any matching forwarding entry the router has no valid next hop.

Incorrect Answers

A:

Router interfaces are not arbitrary fallback paths; without a route there is no valid next-hop selection.

C:

ARP can resolve an on-link next hop but cannot replace a missing routing-table match to an off-link destination.

D:

Administrative distance ranks available same-prefix candidates, and cannot produce a route from an empty match set.

Cisco Certified Network Associate (CCNA) (200-301) Practice Tests

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