100% Latest & Updated Cisco 200-301 Practice Test Questions, Exam Dumps & Verified Answers!
30 Days Free Updates, Instant Download!
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?
- Build a new link-layer Ethernet header for the outgoing hop
- Retain the source and destination MACs of the inbound VLAN 10 frame
- Replace the destination IPv4 address with the next-hop router IP
- 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?
- Prefer the route with the highest administrative distance, regardless of destination mask
- Select the shortest installed matching prefix because it covers the most addresses
- Choose a route only after testing whether the application-layer protocol is HTTPS
- 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?
- Send the Ethernet frame to the router’s own Gi0/1 MAC as its destination
- Consult or populate ARP adjacency
- Use the OSPF router-ID as an Ethernet MAC lookup key
- 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?
- It uses the local /32 receive adjacency so the router processes a packet addressed to itself
- It sends the packet to an adjacent router because the /30 connected route has a lower mask
- It discards every packet to the owned interface IP because local addresses cannot have host routes
- 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?
- Prefer the configured AD 200 static because static routes always beat OSPF
- Choose the static because it has a shorter or lower IPv4 next-hop address
- Compare its greater AD with a present preferred route
- 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?
- Assume an installed route guarantees forwarding regardless of output ACLs
- Check ACL disposition after routing context
- Change the source routing-protocol AD to override the egress interface ACL
- 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?
- Retain the withdrawn OSPF route as installed despite loss of the neighbor
- Prefer the static default 0/0 over the now-valid /16 floating backup
- Use OSPF’s lower old cost as a reason to reject the remaining static
- 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?
- Prefer the still-installed /32 route
- Discard packets to the host solely because the covering /16 aggregate was withdrawn
- Prefer a matching default /0 over the valid installed /32 for that exact destination
- 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?
- It can use the surviving installed next hop; the failed path must no longer be selected
- It must continue alternating evenly between the failed and healthy path
- It must be discarded even though an eligible route remains installed
- 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?
- Take the default because its configured AD 1 is lower than the OSPF AD 110
- Use the specific OSPF route
- Use equal-cost load balancing across the OSPF /24 and default /0
- 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?
- Forward to the lowest numeric local IPv4 interface when no route exists
- Drop the packet and generally signal unreachable as applicable
- Fabricate an ARP entry for the destination to force delivery
- 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