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Cisco 200-301 Practice Test 22

Question 210

A switch enables Dynamic ARP Inspection in a lab VLAN. A static-address printer has no DHCP snooping binding and its valid ARP frames are dropped. What configuration can validate this exception without trusting every access port?

  1. Add a static host ARP entry to the management station and assume DAI reads that station’s cache to authorize the printer port.
  2. Define a narrowly scoped ARP ACL permitting the printer's legitimate IP-to-MAC binding as supported by the platform.
  3. Turn every user access interface into DAI trusted.
  4. Remove all ARP inspection from the VLAN as a permanent fix.

Explanation

Correct Answer

B:

Static IP hosts may need explicit DAI ARP ACL entries when no DHCP snooping binding exists. Constrain the allowance to the verified address/MAC pair.

Incorrect Answers

A:

A management host ARP cache is local neighbor state, not the switch DHCP snooping binding database or a supported DAI validation ACL. Configure the static printer identity on the inspecting device.

C:

Trusting all access ports would permit ARP spoofing by untrusted clients and defeat DAI protection across the VLAN.

D:

Disabling the feature avoids drops but also removes the prevention mechanism for other spoofed ARP messages. A scoped exception retains protection.

Question 211

An IPv6 router has manually configured a static route to 2001:db8:90:7::/64. The technician wants to check whether the route is actually installed, not merely listed in running configuration. Which command helps?

  1. `show ip route static` for IPv4 entries only.
  2. `show ip nat translations` for IPv4 address rewriting.
  3. `show ipv6 route static` and inspect the destination prefix and next hop.
  4. `show mac address-table` for switching destination MACs.

Explanation

Correct Answer

C:

Cisco IOS IPv6 routing table output can filter static entries, showing the installed IPv6 prefix and routing resolution information. It distinguishes active route state from configured intent.

Incorrect Answers

A:

The IPv4 routing table is separate and does not show the IPv6 /64 static entry asked about here. Use the IPv6 route display.

B:

NAT translation output records address mapping events and is not a route installation verification method for the described IPv6 network.

D:

MAC tables map Ethernet destination addresses to switchports and cannot show the routed IPv6 prefix or its next-hop path.

Question 212

An engineer documents an IPv6 LAN as 2001:db8:31:2::/64. A junior technician tries to express its prefix using 255.255.255.0. What format should be used?

  1. IPv6 prefix length /64 rather than an IPv4 dotted-decimal subnet mask.
  2. A MAC address wildcard mask on every host interface.
  3. Only a DNS AAAA record, with no subnet prefix identifier.
  4. A four-octet dotted mask because IPv6 uses IPv4 mask syntax unchanged.

Explanation

Correct Answer

A:

IPv6 uses a 128-bit address and a numeric prefix length defining the leftmost network bits. A /64 commonly identifies an IPv6 LAN subnet.

Incorrect Answers

B:

MAC wildcard filters are unrelated to IPv6 address prefix notation used by routers for connected network and route matching.

C:

AAAA records map names to IPv6 addresses, but do not define or replace the IP prefix length configured on a LAN interface.

D:

Dotted-decimal notation describes 32-bit IPv4 masks. It cannot fully represent a 128-bit IPv6 prefix or its interface identifier portion.

Question 213

An access-switch designated port should not allow a newly attached downstream switch to become the spanning-tree root by sending superior BPDUs. Which protection fits?

  1. Disable spanning tree for the VLAN permanently.
  2. Enable PortFast on every interswitch trunk with no guard.
  3. Raise all link speeds to guarantee root selection.
  4. Apply Root Guard on the intended designated port so superior BPDUs cannot make the downstream switch root through it.

Explanation

Correct Answer

D:

Root Guard keeps a designated port from accepting superior root information and can move it into root-inconsistent state while that condition persists.

Incorrect Answers

A:

Turning off STP removes loop prevention across redundant links and does not provide controlled enforcement of an approved bridge-root location.

B:

PortFast accelerates edge-host forwarding and should not be blindly applied to interswitch links; it does not enforce the described root placement policy.

C:

Link speed can influence path cost, but cannot enforce bridge ID policy or reject superior BPDU advertisements from an unexpected switch.

Question 214

A Windows laptop on an IPv4 LAN shows 169.254.81.10/16 and cannot reach its routed gateway. The user expected an address from the corporate DHCP pool. What symptom does 169.254 indicate?

  1. An IPv6 unique-local address embedded in IPv4 format.
  2. Self-assigned APIPA after failing to obtain a normal DHCP lease.
  3. An RFC1918 DHCP allocation from 172.16.0.0/12.
  4. A valid public internet address assigned by the ISP.

Explanation

Correct Answer

B:

Windows may self-assign an address from 169.254/16 when ordinary DHCP configuration fails. Investigate the client path, relay, server, VLAN and filtering.

Incorrect Answers

A:

IPv6 unique-local uses fc00::/7 and IPv6 colon notation; a dotted 169.254 IPv4 address is not its equivalent.

C:

RFC1918 private ranges do not include 169.254/16. The 172.16/12 block is different, and a 169.254 address usually signals link-local fallback.

D:

IPv4 169.254/16 is link-local and not a public global unicast allocation usable as a normal routed ISP address.

Question 215

An API tool gets HTTP 401 when it sends no credentials, but HTTP 403 when it authenticates with a low-privilege read-only token and attempts a write. What distinction best describes the responses?

  1. 401 means a resource was created and 403 means deletion succeeded.
  2. 403 always means the server is physically unreachable by TCP.
  3. 401 means authentication is required/invalid, while 403 means the authenticated request lacks permission for the operation.
  4. Both indicate that the HTTP method was GET rather than POST.

Explanation

Correct Answer

C:

HTTP 401 generally signals missing or unacceptable authentication credentials; 403 signifies a request that the server refuses, often because authorization is insufficient. Check endpoint-specific policy.

Incorrect Answers

A:

Created and no-content success use 2xx statuses such as 201 and 204. 401 and 403 are client-error categories, not successful business writes.

B:

A 403 is an HTTP response, so the server has been reached at the HTTP layer. It does not in itself prove TCP connectivity failed.

D:

The method alone does not determine whether a request is authenticated or authorized. Different methods can trigger either status based on credentials and permissions.

Question 216

Two OSPF routers share one Ethernet segment and both use area 0, matched timers, masks and authentication. Router A's local process ID is 10 and Router B's is 20. Must the process numbers match to form adjacency?

  1. No; the OSPF process ID is locally significant and compatible neighbor parameters determine adjacency.
  2. Yes; both must use process 1 regardless of platform.
  3. No, because OSPF exchanges routing updates without Hellos.
  4. Yes; the router IDs must equal the two process numbers.

Explanation

Correct Answer

A:

The OSPF router process identifier selects a local configuration instance; it is not exchanged as a required matching neighbor field. Area, network type and relevant parameters matter.

Incorrect Answers

B:

Cisco IOS supports locally chosen OSPF process IDs. They are not required to be 1 or identical across neighbors.

C:

OSPF neighbor discovery normally uses Hello packets. Process ID independence does not mean Hellos or adjacency compatibility checks can be skipped.

D:

Router IDs are separate unique identifiers used in OSPF LSAs and neighbor relationships. They should not both equal locally selected process numbers.

Question 217

An ACL deny entry intended only for 10.23.7.0/24 is accidentally configured with wildcard 0.0.255.255, blocking many 10.23.x.x sources. What is wrong?

  1. A wildcard is the same as a dotted network mask without bit inversion.
  2. The wildcard is too narrow and matches only one host.
  3. Router ACLs ignore wildcard masks when source addresses are present.
  4. The wildcard permits variation in the third octet, matching 10.23.0.0/16 rather than the intended /24.

Explanation

Correct Answer

D:

ACL wildcard 0 bits require exact matches and 1 bits allow variation. For a /24 match use 0.0.0.255; the current wildcard broadens the match by one octet.

Incorrect Answers

A:

ACL wildcard values are inverted relative to common subnet-mask matching, so 255 in a wildcard indicates don't-care bits rather than fixed network bits.

B:

0.0.255.255 includes a large range of host addresses across many third-octet values. It is much broader than a single address match.

C:

Cisco IOS IPv4 ACL address matches use the wildcard supplied in the rule. An incorrect wildcard directly affects which source packets match and get denied.

Question 218

A router's table contains 10.15.0.0/16, 10.15.8.0/21 and 10.15.9.0/24. An inbound packet is headed to 10.15.9.73. Which route is chosen?

  1. The gateway of last resort before any matching local routes.
  2. The installed 10.15.9.0/24 route because it is the longest matching prefix.
  3. The 10.15.0.0/16 route because it has the broadest range.
  4. The /21 automatically wins because 21 is the middle prefix length.

Explanation

Correct Answer

B:

All three prefixes may match the address, but normal route selection uses the largest matching prefix length. The /24 specifies the most bits.

Incorrect Answers

A:

A default route is used only when no more-specific installed match exists. This destination has several, including a /24 host-containing route.

C:

A broad /16 is a fallback for other destinations; its greater address coverage does not make it preferred for the /24's specific host.

D:

Prefixes are not ranked by a middle value or route age. The /24 is more specific than /21 and /16, so it wins.

Question 219

`show etherchannel summary` displays one member interface with a `P` flag and another with `I`. What interpretation is generally correct?

  1. P means administratively powered off; I means included and forwarding.
  2. I means an OSPF interface with default route installed.
  3. P is bundled in a port channel; I means stand-alone rather than participating in the bundle.
  4. Both letters indicate identical successfully bundled status.

Explanation

Correct Answer

C:

In common Cisco EtherChannel summary flags, P indicates the port is bundled, while I is stand-alone. Investigate LACP and compatible member settings.

Incorrect Answers

A:

P does not mean powered off in the EtherChannel member flag context. A bundled member is participating in the logical channel.

B:

OSPF is Layer 3 routing and does not control the letter I in this Layer 2 EtherChannel summary status display.

D:

Distinct flags report different conditions and cannot both be interpreted as successful aggregation. The I member requires troubleshooting.

Question 220

A branch router has a static `0.0.0.0/0` route toward its ISP and no dynamic route for a remote website prefix. Once the next hop resolves and no specific route matches, what path is used?

  1. The installed default static route toward the ISP.
  2. The router must discard packets because default routes cannot be static.
  3. The DNS recursive resolver as a packet-level next hop without routing.
  4. The local VLAN 10 connected route, regardless of website address.

Explanation

Correct Answer

A:

A default route matches any IPv4 destination but is selected only when no longer-prefix entry applies. It sends unknown destinations toward the configured ISP next hop.

Incorrect Answers

B:

IPv4 default routes can be configured manually with static syntax and commonly provide branch Internet egress when valid.

C:

DNS provides name-to-IP resolution. Once the destination address is known, the router uses the routing table rather than sending every packet to a DNS resolver.

D:

A connected VLAN route matches only its local prefix and is not a catch-all for arbitrary Internet destinations.


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