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HP HPE7-A08 Practice Test 40

Question 390

A small unmanaged switch is connected to a protected user port and begins sending STP BPDUs. Which defense fits?

  1. Port security or MAC limiting
  2. BPDU guard on protected access ports
  3. Management AAA and role-based permissions
  4. Audit logging to trusted collector

Explanation

Correct Answer

B:

BPDU protection handles unexpected edge bridges. Unexpected bridge BPDUs should trigger protective action at endpoint-facing ports.

Incorrect Answers

A:

MAC learning restrictions can constrain unexpected endpoint proliferation at the edge. But this does not address the case requirement to protect against a new Layer 2 loop.

C:

Named users should have authorized least-privilege management roles and audited access. But this does not address the case requirement to protect against a new Layer 2 loop.

D:

Security event records help investigate configuration and access changes. But this does not address the case requirement to protect against a new Layer 2 loop.

Question 391

Malformed protocol floods spike CPU utilization on the core control plane. Which protection class should be evaluated?

  1. Port security or MAC limiting
  2. Audit logging to trusted collector
  3. BPDU guard on protected access ports
  4. Control-plane traffic protection

Explanation

Correct Answer

D:

Control-plane policing can constrain traffic sent to switch CPU. Control-plane protection limits disruptive traffic targeting switch processing resources.

Incorrect Answers

A:

MAC learning restrictions can constrain unexpected endpoint proliferation at the edge. But this does not address the case requirement to protect routing and management processing resources.

B:

Security event records help investigate configuration and access changes. But this does not address the case requirement to protect routing and management processing resources.

C:

Unexpected bridge BPDUs should trigger protective action at endpoint-facing ports. But this does not address the case requirement to protect routing and management processing resources.

Question 392

A single desk port unexpectedly learns hundreds of source MACs after a hub is attached. What port control may help?

  1. Audit logging to trusted collector
  2. Encrypted administrative services
  3. Port security or MAC limiting
  4. Control-plane traffic protection

Explanation

Correct Answer

C:

MAC limits restrict excessive learned clients. MAC learning restrictions can constrain unexpected endpoint proliferation at the edge.

Incorrect Answers

A:

Security event records help investigate configuration and access changes. But this does not address the case requirement to constrain unexpected endpoint proliferation.

B:

SSH and HTTPS reduce clear-text exposure compared with insecure management methods. But this does not address the case requirement to constrain unexpected endpoint proliferation.

D:

Control-plane protection limits disruptive traffic targeting switch processing resources. But this does not address the case requirement to constrain unexpected endpoint proliferation.

Question 393

An audit cannot identify who changed trunk VLANs last weekend. What infrastructure is needed?

  1. Port security or MAC limiting
  2. Audit logging to trusted collector
  3. BPDU guard on protected access ports
  4. Control-plane traffic protection

Explanation

Correct Answer

B:

Centralized logs and named admin access establish an audit trail. Security event records help investigate configuration and access changes.

Incorrect Answers

A:

MAC learning restrictions can constrain unexpected endpoint proliferation at the edge. But this does not address the case requirement to retain traceable management events.

C:

Unexpected bridge BPDUs should trigger protective action at endpoint-facing ports. But this does not address the case requirement to retain traceable management events.

D:

Control-plane protection limits disruptive traffic targeting switch processing resources. But this does not address the case requirement to retain traceable management events.

Question 394

A network operator only needs read-only commands but can change all ACLs. Which principle is violated?

  1. Audit logging to trusted collector
  2. Port security or MAC limiting
  3. Encrypted administrative services
  4. Management AAA and role-based permissions

Explanation

Correct Answer

D:

Administrative roles should match least-privilege duties. Named users should have authorized least-privilege management roles and audited access.

Incorrect Answers

A:

Security event records help investigate configuration and access changes. But this does not address the case requirement to reduce excessive control-plane access.

B:

MAC learning restrictions can constrain unexpected endpoint proliferation at the edge. But this does not address the case requirement to reduce excessive control-plane access.

C:

SSH and HTTPS reduce clear-text exposure compared with insecure management methods. But this does not address the case requirement to reduce excessive control-plane access.

Question 395

A broadcast storm also causes management protocol packet loss from CPU exhaustion. What device resource protection might help?

  1. Audit logging to trusted collector
  2. BPDU guard on protected access ports
  3. Control-plane traffic protection
  4. Port security or MAC limiting

Explanation

Correct Answer

C:

Control-plane protection prioritizes and bounds processing traffic. Control-plane protection limits disruptive traffic targeting switch processing resources.

Incorrect Answers

A:

Security event records help investigate configuration and access changes. But this does not address the case requirement to protect CPU and control packets from floods.

B:

Unexpected bridge BPDUs should trigger protective action at endpoint-facing ports. But this does not address the case requirement to protect CPU and control packets from floods.

D:

MAC learning restrictions can constrain unexpected endpoint proliferation at the edge. But this does not address the case requirement to protect CPU and control packets from floods.

Question 396

A lab access port may host one registered device only, but many MAC addresses suddenly appear. What edge setting should be checked?

  1. Encrypted administrative services
  2. Control-plane traffic protection
  3. Management AAA and role-based permissions
  4. Port security or MAC limiting

Explanation

Correct Answer

D:

MAC-based port limits reveal unauthorized attachment proliferation. MAC learning restrictions can constrain unexpected endpoint proliferation at the edge.

Incorrect Answers

A:

SSH and HTTPS reduce clear-text exposure compared with insecure management methods. But this does not address the case requirement to enforce expected source-MAC count.

B:

Control-plane protection limits disruptive traffic targeting switch processing resources. But this does not address the case requirement to enforce expected source-MAC count.

C:

Named users should have authorized least-privilege management roles and audited access. But this does not address the case requirement to enforce expected source-MAC count.

Question 397

An authenticated voice gateway marks packets DSCP EF according to an approved trust model. What boundary decision matters?

  1. 802.1p PCP and CoS interpretation
  2. Trust DSCP at authorized boundary
  3. Classify and remark untrusted traffic
  4. Verify active QoS classification

Explanation

Correct Answer

B:

Trust DSCP only from authenticated policy-authorized sources. Only approved sources should have their IP DSCP markings accepted as trustworthy.

Incorrect Answers

A:

PCP in the VLAN tag carries Layer 2 class-of-service markings. But this does not address the case requirement to accept valid priority markings from trusted devices.

C:

Re-marking based on policy prevents clients from arbitrarily claiming high priority. But this does not address the case requirement to accept valid priority markings from trusted devices.

D:

Applied maps and counters show whether packets receive intended treatment. But this does not address the case requirement to accept valid priority markings from trusted devices.

Question 398

Guests mark bulk traffic EF to jump ahead of phone calls. What configuration action is needed?

  1. Classify and remark untrusted traffic
  2. DSCP field and IP precedence
  3. Queue-profile mapping
  4. Trust DSCP at authorized boundary

Explanation

Correct Answer

A:

Classify and rewrite untrusted markings by policy. Re-marking based on policy prevents clients from arbitrarily claiming high priority.

Incorrect Answers

B:

The IP header DSCP identifies differentiated services handling across Layer 3 hops. But this does not address the case requirement to stop unauthorized self-prioritization.

C:

QoS maps local priorities or marked classes to actual egress queues. But this does not address the case requirement to stop unauthorized self-prioritization.

D:

Only approved sources should have their IP DSCP markings accepted as trustworthy. But this does not address the case requirement to stop unauthorized self-prioritization.

Question 399

A tagged Ethernet frame carries three PCP bits indicating Layer 2 priority. Which marking family is this?

  1. 802.1p PCP and CoS interpretation
  2. Classify and remark untrusted traffic
  3. DSCP field and IP precedence
  4. Verify active QoS classification

Explanation

Correct Answer

A:

802.1p CoS is carried in VLAN tag PCP. PCP in the VLAN tag carries Layer 2 class-of-service markings.

Incorrect Answers

B:

Re-marking based on policy prevents clients from arbitrarily claiming high priority. But this does not address the case requirement to interpret Ethernet class of service.

C:

The IP header DSCP identifies differentiated services handling across Layer 3 hops. But this does not address the case requirement to interpret Ethernet class of service.

D:

Applied maps and counters show whether packets receive intended treatment. But this does not address the case requirement to interpret Ethernet class of service.

Question 400

A routed campus uses a six-bit value in the IP differentiated services header. What is being read?

  1. Trust DSCP at authorized boundary
  2. DSCP field and IP precedence
  3. 802.1p PCP and CoS interpretation
  4. Queue-profile mapping

Explanation

Correct Answer

B:

DSCP encodes IP-layer per-hop class information. The IP header DSCP identifies differentiated services handling across Layer 3 hops.

Incorrect Answers

A:

Only approved sources should have their IP DSCP markings accepted as trustworthy. But this does not address the case requirement to identify the Layer 3 QoS marker.

C:

PCP in the VLAN tag carries Layer 2 class-of-service markings. But this does not address the case requirement to identify the Layer 3 QoS marker.

D:

QoS maps local priorities or marked classes to actual egress queues. But this does not address the case requirement to identify the Layer 3 QoS marker.

HPE Network Switching Professional (HPE7-A08) Practice Tests

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