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Exam Code: 200-301

Exam Name Cisco Certified Network Associate (CCNA)

Certification Provider: Cisco

Corresponding Certification: CCNA

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Cisco 200-301 Practice Test 39

Question 380

A change advisory for Pinecrest Schools has two requirements: (1) explain why a legacy repeater shared across several hosts has collisions, and (2) select a medium immune to electromagnetic interference in an industrial plant. Select TWO actions that together satisfy both outcomes.

  1. Recognize a shared half-duplex Ethernet collision domain
  2. Use a suitable /30 traditional point-to-point subnet
  3. Use fiber-optic cabling with suitable optics
  4. Split the /24 into eight blocks of 32 addresses
  5. Add or update the source MAC and VLAN entry on the receiving interface

Explanation

Correct Answers

A:

Correct for outcome (1): A repeater repeats bits across hosts, so overlapping transmissions contend for the same medium. The other outcome needs its separate action.

C:

Correct for outcome (2): Optical signaling is not affected by electrical EMI in the way copper signaling can be. It complements the first required control.

Incorrect Answers

B:

Not selected: Use a suitable /30 traditional point-to-point subnet is for allocate a point-to-point routed IPv4 link using two usable host addresses. A /30 contains four total addresses and two ordinarily usable interface addresses. This does not provide either of the two specified controls.

D:

Not selected: Split the /24 into eight blocks of 32 addresses is for create equal /27 subnets from a /24. Borrowing three host bits creates eight /27 subnets, each normally offering 30 usable hosts. This is not one of the two required changes.

E:

Not selected: Add or update the source MAC and VLAN entry on the receiving interface is for learn which switch port owns a newly seen source MAC. A learning switch updates its CAM table from the incoming frame's source address. This is outside the two requested outcomes.

Question 381

The routing table carries the connected 10.20.30.0/24 network into OSPF, but an expected neighbor on Gi0/1 never appears. The local OSPF interface shows passive-interface Gi0/1; link and area settings are otherwise healthy. Which change restores neighbor discovery on that link?

  1. Convert every LAN interface to passive so their routing tables become identical.
  2. Lower the static route administrative distance so OSPF starts sending hellos.
  3. Increase the OSPF cost of Gi0/1 while leaving the passive setting in place.
  4. Remove Gi0/1 from OSPF passive-interface status so hello packets can be exchanged on that neighbor-facing link.

Explanation

Correct Answer

D:

A passive OSPF interface may advertise its attached network but suppresses outbound hellos and thus cannot discover neighbors on that interface. Unset passive status only where adjacency is intended.

Incorrect Answers

A:

Making the neighbor-facing interface passive would continue to prevent hello exchange.

B:

Route administrative distance does not override interface-level passive OSPF behavior.

C:

Changing metric cannot establish an adjacency while hellos remain suppressed.

Question 382

S1 sends untagged native-VLAN 10 traffic over a trunk, but receiving S2 classifies untagged frames into native VLAN 20. Which risk follows from this native VLAN mismatch?

  1. Untagged traffic can be placed in the wrong VLAN on receipt, causing segmentation and connectivity problems.
  2. The switch automatically rewrites all IPv4 source addresses to correct the VLAN
  3. The receiver necessarily discards all 802.1Q-tagged frames on other VLANs
  4. The mismatch changes OSPF router IDs on both switches

Explanation

Correct Answer

A:

Native VLAN settings must agree when untagged frames are used. Different receiver classification can leak or misdirect Layer 2 traffic between unintended VLAN domains.

Incorrect Answers

B:

Native VLAN handling is Layer 2 classification, not automatic NAT.

C:

A native mismatch primarily affects untagged interpretation, not every other tagged VLAN.

D:

A trunk native-VLAN setting does not alter OSPF identity fields.

Question 383

A branch design for Hillcrest Utilities has two requirements: (1) send an IPv6 packet to every member of a multicast group, and (2) check why two 1-Gbps endpoints link at only 100 Mbps. Which option meets both stated needs?

  1. First, validate gateway and host network portions under the configured mask; then review the negotiated speed and the cable/PHY capabilities on both ends.
  2. First, use the appropriate FF00::/8 multicast destination; then deploy a SOHO integrated gateway.
  3. First, deploy an application server on a reachable network; then use a Layer 3 switch with switched virtual interfaces and IP routing.
  4. First, use the appropriate FF00::/8 multicast destination; then review the negotiated speed and the cable/PHY capabilities on both ends.

Explanation

Correct Answer

D:

Both outcomes are covered: (1) IPv6 multicast addresses identify groups, unlike a broadcast address. (2) Autonegotiation and cabling quality can constrain the actual operating link speed. Neither action is a substitute for the other.

Incorrect Answers

A:

The second step covers (2), but the first addresses avoid assigning a gateway outside a host's IPv4 subnet. A directly reachable default gateway normally needs an on-link address in the host's subnet. It leaves outcome (1) unfulfilled.

B:

The first step covers (1), but the second addresses serve a home office with one combined firewall, switch, and wireless radio. An all-in-one small-office appliance consolidates routing, NAT, Ethernet access and Wi-Fi. It leaves outcome (2) unfulfilled.

C:

Neither step is the requested pair: Deploy an application server on a reachable network is for host a central application consumed by employee laptops, and Use a Layer 3 switch with switched virtual interfaces and IP routing is for enable inter-VLAN routing on a campus distribution device. A server offers shared application services while endpoint hosts initiate requests. The proposed plan misses the two stated outcomes.

Question 384

During a review, the administrator for Stonebridge Learning is asked to show the assigned IPv4 and IPv6 addresses on a Linux interface. Which approach satisfies the precise requirement?

  1. Run ip address show on Linux
  2. Use a next-generation firewall with relevant application policies
  3. Classify 172.16.0.0 through 172.31.255.255 as private
  4. Compare the available channel allocations in the regulatory domain

Explanation

Correct Answer

A:

The ip command displays local interface addresses without assuming legacy ifconfig is installed. This is the control that implements the specified requirement.

Incorrect Answers

B:

A next-generation firewall can classify application traffic and track sessions before permitting flows. That is not sufficient here: The ip command displays local interface addresses without assuming legacy ifconfig is installed.

C:

Only 172.16/12 is private, not all addresses beginning 172. That is not sufficient here: The ip command displays local interface addresses without assuming legacy ifconfig is installed.

D:

The 5-GHz band typically offers more nonoverlapping usable channels, with DFS restrictions on some ranges. That is not sufficient here: The ip command displays local interface addresses without assuming legacy ifconfig is installed.

Question 385

At Granite Works, an engineer must identify a risk from using poor-quality network telemetry to train AI. Which action directly meets this requirement?

  1. Recognize an object property written as a quoted key followed by a colon
  2. Validate data quality, missing values and representative baselines
  3. Use controlled network automation with validated templates
  4. Use HTTP PATCH on a supporting REST resource

Explanation

Correct Answer

B:

Incomplete or biased telemetry can produce misleading predictive network recommendations. This is the control that implements the specified requirement.

Incorrect Answers

A:

JSON objects store named properties with string keys and supported value types. That is not sufficient here: Incomplete or biased telemetry can produce misleading predictive network recommendations.

C:

Automation applies repeatable tested configuration rather than relying on individually typed changes. That is not sufficient here: Incomplete or biased telemetry can produce misleading predictive network recommendations.

D:

PATCH applies a partial update to a resource under the API's defined semantics. That is not sufficient here: Incomplete or biased telemetry can produce misleading predictive network recommendations.

Question 386

A change advisory for Riverside Data has two requirements: (1) match any address in 10.3.8.0/24 using wildcard notation, and (2) block only inbound Telnet to a server without blocking SSH. Which proposed plan satisfies both outcomes?

  1. First, use wildcard 0.0.0.255 with base 10.3.8.0; then write an extended ACL permitting the host/source and destination subnet with appropriate transport.
  2. First, use wildcard 0.0.0.255 with base 10.3.8.0; then deny TCP destination port 23 with the intended host match, and permit TCP 22 as required.
  3. First, apply unique credentials with a password manager and rotation policy; then deny TCP destination port 23 with the intended host match, and permit TCP 22 as required.
  4. First, apply sufficiently long unique passphrases with account protection; then enforce multifactor authentication where available.

Explanation

Correct Answer

B:

Both outcomes are covered: (1) A wildcard bit set to one means ignore that address bit for ACL matching. (2) TCP port 23 identifies Telnet, while SSH normally uses TCP port 22. Neither action is a substitute for the other.

Incorrect Answers

A:

The first step covers (1), but the second addresses allow one IPv4 source host to reach a management subnet while denying others. Extended ACLs can match both source and destination address criteria for selective traffic policy. It leaves outcome (2) unfulfilled.

C:

The second step covers (2), but the first addresses reduce password reuse across device administrators. Unique secrets prevent one compromise from automatically exposing all devices. It leaves outcome (1) unfulfilled.

D:

Neither step is the requested pair: Apply sufficiently long unique passphrases with account protection is for improve account defense against guessed short passwords, and Enforce multifactor authentication where available is for raise security of admin sign-in beyond only a password. Length, uniqueness and rate controls resist common password guessing attacks. The proposed plan misses the two stated outcomes.

Question 387

A change advisory for Riverside Data has two requirements: (1) check whether a configured static route is installed, and (2) remove a stale configured IPv4 static route without altering newer dynamic routes. Which option meets both stated needs?

  1. First, use ip route 10.40.8.0 255.255.254.0 with the valid next hop; then negate the matching ip route statement with no ip route.
  2. First, inspect show ip route static and next-hop reachability; then configure the matching OSPF area number on their shared link.
  3. First, find the default 0.0.0.0/0 route and gateway of last resort; then investigate interface MTU mismatch and adjacency parameters.
  4. First, inspect show ip route static and next-hop reachability; then negate the matching ip route statement with no ip route.

Explanation

Correct Answer

D:

Both outcomes are covered: (1) A static route must resolve an eligible next hop or egress path to be usable. (2) Removing the static configuration affects that route, not the unrelated dynamic routing protocol. Neither action is a substitute for the other.

Incorrect Answers

A:

The second step covers (2), but the first addresses install a network static route to 10.40.8.0/23. A /23 mask covers the two adjacent /24s 10.40.8.0 and 10.40.9.0. It leaves outcome (1) unfulfilled.

B:

The first step covers (1), but the second addresses make two routers with mismatched OSPF area IDs become neighbors. OSPF neighbors must agree on the area for an eligible adjacency. It leaves outcome (2) unfulfilled.

C:

Neither step is the requested pair: Find the default 0.0.0.0/0 route and gateway of last resort is for identify the route of last resort in an IPv4 routing table, and Investigate interface MTU mismatch and adjacency parameters is for explain why two OSPF routers remain stuck in EXSTART. A default route handles destinations not covered by a more-specific installed route. The proposed plan misses the two stated outcomes.

Question 388

Switches on one Rapid PVST+ VLAN instance advertise these bridge IDs: SW-1 (priority 20480, MAC 4cf556b0303b); SW-2 (priority 24576, MAC 8f7e0e480ffb); SW-3 (priority 32768, MAC 5476170f0f46); SW-4 (priority 4096, MAC 5a7c8ca94b96). They are powered on with no previous root. Which switch is the elected root?

  1. SW-3 (priority 32768, MAC 5476170f0f46)
  2. SW-2 (priority 24576, MAC 8f7e0e480ffb)
  3. SW-4 (priority 4096, MAC 5a7c8ca94b96)
  4. SW-1 (priority 20480, MAC 4cf556b0303b)

Explanation

Correct Answer

C:

The STP root is the switch with the numerically lowest bridge ID: priority is compared first, followed by MAC on ties. SW-4 has the lowest priority 4096.

Incorrect Answers

A:

Its advertised priority is greater than the winner 4096, and no tie breaker changes the result.

B:

That explanation does not distinguish this option. “SW-2 (priority 24576, MAC 8f7e0e480ffb)” is an alternative action, but it does not by itself establish the outcome required in this case.

D:

That explanation does not distinguish this option. “SW-1 (priority 20480, MAC 4cf556b0303b)” is an alternative action, but it does not by itself establish the outcome required in this case.

Question 389

A Rapid PVST+ switch has one forwarding root port and one discarding alternate port toward a different upstream switch. What is the alternate port's purpose?

  1. To forward every user frame across both uplinks at the same time.
  2. To provide a standby alternate path toward the root when the active root-port path fails.
  3. To act as the root bridge for that VLAN instance.
  4. To carry only management traffic while the root port carries user traffic.

Explanation

Correct Answer

B:

RSTP blocks the alternate during normal operation to prevent loops and can transition it during a topology change.

Incorrect Answers

A:

The alternate is normally discarding; forwarding both without a loop-free design defeats STP.

C:

A port role is not a switch root-bridge election result.

D:

Alternate/root roles are chosen by STP topology, not by separating management and application traffic.

Question 390

An acceptance check at Copperline Studios has two requirements: (1) identify which router becomes the OSPF DR among two equal-priority routers, and (2) remove a stale configured IPv4 static route without altering newer dynamic routes. Select TWO actions that together satisfy both outcomes.

  1. Give the backup static route AD higher than OSPF's 110
  2. Negate the matching ip route statement with no ip route
  3. Look for a route marked O in the IPv4 route table
  4. Configure passive-interface on the relevant OSPF interface
  5. Compare their configured router IDs

Explanation

Correct Answers

B:

Correct for outcome (2): Removing the static configuration affects that route, not the unrelated dynamic routing protocol. It complements the first required control.

E:

Correct for outcome (1): Higher router ID wins the DR election priority tie when both are otherwise eligible. The other outcome needs its separate action.

Incorrect Answers

A:

Not selected: Give the backup static route AD higher than OSPF's 110 is for provide a static backup only if an OSPF route to the same prefix disappears. A floating static route loses normally but is installed when the preferred OSPF route is withdrawn. This is outside the two requested outcomes.

C:

Not selected: Look for a route marked O in the IPv4 route table is for recognize a route learned through single-area OSPF in the routing table. Cisco IOS uses an O routing protocol code for ordinary OSPF intra-area routes. This does not provide either of the two specified controls.

D:

Not selected: Configure passive-interface on the relevant OSPF interface is for prevent an interface from sending OSPF hello packets while still advertising its connected network. Passive interfaces suppress OSPF neighbor hello formation while eligible network prefixes remain advertised. This is not one of the two required changes.