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Designing Cisco Enterprise Networks (ENSLD) v2.0 Quiz Questions and Answers

Answer :
  • The switch connected to the phone provides the VLAN

Explanation :

When using auxiliary VLANs, the switch connected to the phone provides the VLAN to the phone. IP telephones typically have a built in 3-port 10/100 hub. One port internally attaches to the phone, one port is attached to the switch access port, and the other is used to connect to the workstation. The PC attached to the switch port via the IP phone is unaware of the presence of the phone Objective: Layer 2 Technologies - Sub-Objective: Configure and verify VLANs - References: Cisco > Home > Products and Services > Cisco Interfaces and Modules > Cisco Network Modules > Product Literature > Data Sheets > Cisco Catalyst 6500 Series Switches - Cisco > Cisco IOS Interface and Hardware Component Command Reference > squelch through system jumbomtu > switchport voice vlan
Answer :
  • 50 seconds

Explanation :

t usually takes 50 seconds for a port to transition from the blocking state to the forwarding state in STP. This delay is a function of the default settings for the forward-delay and max-age settings. The max-age delay is 20 seconds by default, and is used to transition from the blocking to the listening state. The forward- delay setting is 15 seconds by default. This timer is used in the transition from the listening to learning states, and again for the transition from the learning to the forwarding state.
Answer :
  • MAC flooding

Explanation :

MAC flooding is an attack technique in which frames with unique, but invalid, source MAC addresses flood the switch and exhaust the CAM table space. Eventually no more MAC addresses can be added because the table is full. When this occurs, any packets destined for a MAC address not in the table will be flooded to all other ports. This would allow the attacker to see the flooded traffic and capture information. The switch would be essentially functioning as a hub in this case.
Answer :
  • Lightweight mode

Explanation :

Lightweight access point protocol (LWAPP)-enabled access points operate in lightweight mode. LWAPP is a protocol used to allow centralized management of APs. The management components are removed from the APs, and a WLAN controller provides a single point of management. This controller coordinates WLAN access, managing the load on the APs and user movement between APs.
Answer :
  • 6 seconds

Explanation :

With Rapid Spanning Tree Protocol (RSTP) hello timers set at the default interval, a non-edge port can discover that its neighbor is down in 6 seconds. One of the advantages of RSTP over STP is quicker convergence when changes occur in the topology. After a non-edge port fails to receive three Bridge Protocol Data Units
Answer :
  • Learning
  • Forwarding
  • Discarding

Explanation :

Rapid Spanning Tree Protocol (RSTP) uses only three port states: discarding, learning, and forwarding. The learning and forwarding states are the same as the original STP standard, but the discarding state performs the functions originally performed in the disabled, blocking, and listening STP states.