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Question 380
After valid DHCP assignments, the switch records client IP-to-MAC associations on each access port. What database is being built?
- First-hop security troubleshooting
- DHCP snooping binding learning
- Protected edge port behavior
- IP source guard enforcement
Explanation
Correct Answer
B:Snooping bindings link issued addresses to endpoints. The switch can learn authorized IP/MAC/VLAN/port associations from valid DHCP exchanges.
Incorrect Answers
A:Inspect trust status, bindings and drops before disabling the whole protection service. But this does not address the case requirement to track legitimate client address leases.
C:Security should primarily treat endpoint-facing ports as untrusted ingress where appropriate. But this does not address the case requirement to track legitimate client address leases.
D:Source guard can restrict spoofed client IP use based on trusted binding information. But this does not address the case requirement to track legitimate client address leases.
Question 381
A host sends ARP packets falsely claiming to own the gateway IP. Which control can validate the claim?
- First-hop security troubleshooting
- Dynamic ARP Inspection validation
- DHCP snooping trusted uplinks
- IP source guard enforcement
Explanation
Correct Answer
B:ARP inspection can compare replies against trusted bindings. ARP inspection can check ARP claims against approved bindings on supported platforms.
Incorrect Answers
A:Inspect trust status, bindings and drops before disabling the whole protection service. But this does not address the case requirement to prevent ARP impersonation where supported.
C:Only approved server-facing paths should be trusted to forward DHCP server responses. But this does not address the case requirement to prevent ARP impersonation where supported.
D:Source guard can restrict spoofed client IP use based on trusted binding information. But this does not address the case requirement to prevent ARP impersonation where supported.
Question 382
A client spoofs another valid IPv4 address on a protected access port. Which feature may limit it?
- DHCP snooping trusted uplinks
- First-hop security troubleshooting
- IP source guard enforcement
- Dynamic ARP Inspection validation
Explanation
Correct Answer
C:IP source guard checks permitted source-address use. Source guard can restrict spoofed client IP use based on trusted binding information.
Incorrect Answers
A:Only approved server-facing paths should be trusted to forward DHCP server responses. But this does not address the case requirement to restrict packets whose source IP lacks an approved binding.
B:Inspect trust status, bindings and drops before disabling the whole protection service. But this does not address the case requirement to restrict packets whose source IP lacks an approved binding.
D:ARP inspection can check ARP claims against approved bindings on supported platforms. But this does not address the case requirement to restrict packets whose source IP lacks an approved binding.
Question 383
An engineer trusts all endpoint ports for DHCP snooping to stop complaints. What security boundary is defeated?
- DHCP snooping binding learning
- DHCP snooping trusted uplinks
- IP source guard enforcement
- Protected edge port behavior
Explanation
Correct Answer
D:Edge client ports should generally be untrusted. Security should primarily treat endpoint-facing ports as untrusted ingress where appropriate.
Incorrect Answers
A:The switch can learn authorized IP/MAC/VLAN/port associations from valid DHCP exchanges. But this does not address the case requirement to preserve first-hop protection against malicious endpoints.
B:Only approved server-facing paths should be trusted to forward DHCP server responses. But this does not address the case requirement to preserve first-hop protection against malicious endpoints.
C:Source guard can restrict spoofed client IP use based on trusted binding information. But this does not address the case requirement to preserve first-hop protection against malicious endpoints.
Question 384
Legitimate clients lose DHCP because the actual server path is configured untrusted. What should be inspected?
- DHCP snooping binding learning
- First-hop security troubleshooting
- Dynamic ARP Inspection validation
- Protected edge port behavior
Explanation
Correct Answer
B:Trust design and drop counters expose incorrect classification. Inspect trust status, bindings and drops before disabling the whole protection service.
Incorrect Answers
A:The switch can learn authorized IP/MAC/VLAN/port associations from valid DHCP exchanges. But this does not address the case requirement to fix server-facing trusted-port settings.
C:ARP inspection can check ARP claims against approved bindings on supported platforms. But this does not address the case requirement to fix server-facing trusted-port settings.
D:Security should primarily treat endpoint-facing ports as untrusted ingress where appropriate. But this does not address the case requirement to fix server-facing trusted-port settings.
Question 385
An unknown laptop tries to offer DHCP leases on a classroom port. What feature should reject those offers?
- Dynamic ARP Inspection validation
- DHCP snooping trusted uplinks
- First-hop security troubleshooting
- DHCP snooping binding learning
Explanation
Correct Answer
B:Trusted-versus-untrusted port configuration protects the DHCP path. Only approved server-facing paths should be trusted to forward DHCP server responses.
Incorrect Answers
A:ARP inspection can check ARP claims against approved bindings on supported platforms. But this does not address the case requirement to block a rogue DHCP server.
C:Inspect trust status, bindings and drops before disabling the whole protection service. But this does not address the case requirement to block a rogue DHCP server.
D:The switch can learn authorized IP/MAC/VLAN/port associations from valid DHCP exchanges. But this does not address the case requirement to block a rogue DHCP server.
Question 386
An ARP poisoning attempt maps a known router IP to an attacker's MAC. What validation tool is relevant?
- Protected edge port behavior
- IP source guard enforcement
- Dynamic ARP Inspection validation
- DHCP snooping binding learning
Explanation
Correct Answer
C:Dynamic ARP Inspection can validate source bindings. ARP inspection can check ARP claims against approved bindings on supported platforms.
Incorrect Answers
A:Security should primarily treat endpoint-facing ports as untrusted ingress where appropriate. But this does not address the case requirement to limit forged ARP identity announcements.
B:Source guard can restrict spoofed client IP use based on trusted binding information. But this does not address the case requirement to limit forged ARP identity announcements.
D:The switch can learn authorized IP/MAC/VLAN/port associations from valid DHCP exchanges. But this does not address the case requirement to limit forged ARP identity announcements.
Question 387
DHCP leases fail immediately after snooping activation on a distribution uplink. What should be reviewed?
- First-hop security troubleshooting
- Protected edge port behavior
- Dynamic ARP Inspection validation
- IP source guard enforcement
Explanation
Correct Answer
A:The upstream server-facing link may not be marked trusted. Inspect trust status, bindings and drops before disabling the whole protection service.
Incorrect Answers
B:Security should primarily treat endpoint-facing ports as untrusted ingress where appropriate. But this does not address the case requirement to restore legitimate DHCP server traffic.
C:ARP inspection can check ARP claims against approved bindings on supported platforms. But this does not address the case requirement to restore legitimate DHCP server traffic.
D:Source guard can restrict spoofed client IP use based on trusted binding information. But this does not address the case requirement to restore legitimate DHCP server traffic.
Question 388
Contractors share an unrestricted administrative credential, making change attribution impossible. Which control should be adopted?
- Control-plane traffic protection
- Audit logging to trusted collector
- Management AAA and role-based permissions
- BPDU guard on protected access ports
Explanation
Correct Answer
C:Named AAA identities and constrained roles improve accountability. Named users should have authorized least-privilege management roles and audited access.
Incorrect Answers
A:Control-plane protection limits disruptive traffic targeting switch processing resources. But this does not address the case requirement to limit and audit management privileges.
B:Security event records help investigate configuration and access changes. But this does not address the case requirement to limit and audit management privileges.
D:Unexpected bridge BPDUs should trigger protective action at endpoint-facing ports. But this does not address the case requirement to limit and audit management privileges.
Question 389
A legacy monitoring tool requests Telnet access over the same public management route. What safer service should replace it?
- Audit logging to trusted collector
- Port security or MAC limiting
- Encrypted administrative services
- Management AAA and role-based permissions
Explanation
Correct Answer
C:Encrypted administrative protocols protect credentials. SSH and HTTPS reduce clear-text exposure compared with insecure management methods.
Incorrect Answers
A:Security event records help investigate configuration and access changes. But this does not address the case requirement to avoid clear-text remote management sessions.
B:MAC learning restrictions can constrain unexpected endpoint proliferation at the edge. But this does not address the case requirement to avoid clear-text remote management sessions.
D:Named users should have authorized least-privilege management roles and audited access. But this does not address the case requirement to avoid clear-text remote management sessions.
Question 390
A small unmanaged switch is connected to a protected user port and begins sending STP BPDUs. Which defense fits?
- Port security or MAC limiting
- BPDU guard on protected access ports
- Management AAA and role-based permissions
- 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.
HPE Network Switching Professional (HPE7-A08) Practice Tests