400-007 Practice Questions

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A (IGMP Snooping): Controls IPv4 multicast traffic within VLANs by listening to IGMP join/leave messages and forwarding multicast only to interested ports.

B (MLD Snooping): Performs similar multicast control for IPv6 multicast traffic by listening to MLD protocol messages.

Both technologies reduce unnecessary multicast flooding inside VLANs.

Why other options are incorrect:

C (RGMP): Controls multicast on router-connected ports, not intra-VLAN.

D (PIM Snooping): Operates on PIM-enabled Layer 3 devices; less relevant for pure VLAN-based Layer 2 multicast control.

E (Pruning): Refers to multicast tree pruning in Layer 3 multicast routing, not VLAN Layer 2 control.

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A (Redundant AAA servers): Protects control plane authentication services from becoming a single point of failure.

B (Control Plane Policing): Limits and controls control plane traffic to prevent CPU exhaustion attacks (DoS, reconnaissance).

F (Routing protocol authentication): Ensures control plane integrity by validating peer identity and preventing spoofed routing updates.

Why other options are incorrect:

C: Warning banners are part of management plane policies.

D: Enabling unused services weakens security posture.

E: SNMPv3 protects management plane, not control plane directly.

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B (Strategic planning): Long-term business-aligned decisions that shape future infrastructure needs.

D (Tactical planning): Short-to-mid-term activities that adjust design based on evolving operational realities, constraints, and priorities.

Why other options are incorrect:

A & E: While cost and business optimization are goals, they are not defined planning approaches.

C: Modular is a design methodology, not a planning approach.

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For accurate location tracking in wireless networks, signal triangulation methods like RSSI, TDoA, or Angle of Arrival require:

A (Perimeter coverage): Adding APs along the perimeter improves location accuracy by minimizing blind spots and improving triangulation geometry.

B (Higher density, <40 ft spacing): Reducing inter-AP distance increases overlapping coverage, which provides more data points for accurate positioning.

Other options explained:

C: Directional antennas limit overlapping coverage, reducing triangulation accuracy.

D: Monitor mode APs can assist in location services but are secondary to proper placement and density.

E: Increasing transmit power may enlarge cell size but can decrease accuracy by reducing overlapping AP zones.