Cisco 642-742 Online Practice Questions and Exam Preparation

Cisco 642-742 Online Questions & Answers

• Question 61:

  Which two statements are correct if IGMP snooping is enabled on a Cisco WLC v7.0? (Choose two.)

  A. The router IGMP table is updated with the IP address of the wireless clients as the last reporter.
  B. The IGMP packets from the wireless clients are forwarded to the router without modifications.
  C. The IGMP packets from the wireless clients are received at the Cisco WLC, which generates a query for the client.
  D. The IGMP packets from the wireless clients are received at the WLC and are used to update the router via a Cisco Group Management Protocol update from the Cisco WLC.
  E. The router IGMP table is updated with the IP address of the Cisco WLC as the last reporter.
  C. The IGMP packets from the wireless clients are received at the Cisco WLC, which generates a query for the client.
  E. The router IGMP table is updated with the IP address of the Cisco WLC as the last reporter.

• Question 62:

  Which of these statements best describes Cisco Centralized Key Management?

  A. It allows wireless clients to cache their credentials so that, while they are roaming, they do not need to reauthenticate to the wireless infrastructure.
  B. It allows the wireless infrastructure to cache the credentials, thus eliminating the need to conduct a full reauthentication when roaming.
  C. It enables the controller to send directed roam requests to a client in situations when the controller can better service the client on a different AP than the one to which the client is associated.
  D. By caching their credentials, it helps clients save scanning time when looking for a new AP to join.
  B. It allows the wireless infrastructure to cache the credentials, thus eliminating the need to conduct a full reauthentication when roaming.

• Question 63:

  Which of these authentication and encryption combinations would be considered the most secure?

  A. LEAP and WPA TKIP
  B. EAP-FAST and WPA2 AES
  C. EAP-FAST and WPA TKIP
  D. WPA-PSK and TKIP
  B. EAP-FAST and WPA2 AES

• Question 64:

  What is the main difference between the Cisco Unified Wireless IP Phones 7921G and 7925G?

  A. The 7925G supports 802.11a/b/g, whereas the 7921G supports only 802.11b/g.
  B. The 7925G is suited for a more rugged environment.
  C. The 7925G has support for 802.11n, whereas the 7921G does not.
  D. 7925G supports WPA2, whereas the 7921G supports only WPA1.
  B. The 7925G is suited for a more rugged environment.

• Question 65:

  You have recently enabled multicast on your WLAN. When users join the multicast sessions, you see the traffic utilization on all the APs that are controlled by the Cisco WLC v7.0 increase, which includes those APs where there are no multicast clients.

  Which configuration parameter needs to be verified to prevent APs with no subscribed multicast clients from receiving traffic?

  A. Switches between the Cisco WLC and APs are not configured for IGMP snooping.
  B. The router interface that services the multicast needs to be configured for the sparse-dense multicast mode of operation.
  C. APs are not configured for IGMP snooping.
  D. The Cisco WLC is not configured for IGMP snooping.
  E. This is normal operation and cannot be changed.
  D. The Cisco WLC is not configured for IGMP snooping.

• Question 66:

  Refer to the exhibit.

  

  What two items of multicast information can be interpreted from the WLC display? (Choose two.)

  A. WLC-to-AP multicast mode is configured for Unicast.
  B. WLC-to-AP multicast mode is configured for multicast.
  C. IGMP snooping is disabled.
  D. IGMP snooping is enabled.
  E. VideoStream is allowed for the wireless client.
  F. VideoStream is not allowed for the wireless client.
  D. IGMP snooping is enabled.
  E. VideoStream is allowed for the wireless client.

• Question 67:

  What address do PIM routers listen to in order to automatically discover the best RP for each multicast group?

  A. 224.0.1.40
  B. 224.0.1.39
  C. 224.0.0.13
  D. 224.0.0.14
  A. 224.0.1.40

• Question 68:

  Which four statements describe attributes of interactive video? (Choose four.)

  A. Packet loss is limited to 1 percent.
  B. Packet loss is limited to 5 percent.
  C. One-way latency is limited to 150 ms.
  D. One-way latency is limited to a few seconds.
  E. Jitter is limited to 30 ms.
  F. Jitter has no significant requirements.
  G. QoS marking is at CS4.
  H. QoS marking is at AF41.
  A. Packet loss is limited to 1 percent.
  C. One-way latency is limited to 150 ms.
  E. Jitter is limited to 30 ms.
  H. QoS marking is at AF41.

• Question 69:

  A network engineer is deploying wireless voice with a 20% overlap at -67dBm. After testing, the cell edge is determined to be 50 feet from the AP. How far away should the next AP be placed?

  A. 60 feet
  B. 70 feet
  C. 80 feet
  D. 90 feet
  E. 100 feet
  D. 90 feet

• Question 70:

  An engineer is designing a wireless infrastructure to support secured wireless access for Cisco 7925 series phones. What 802.1X authentication protocol would create the least overhead for authentication, while also securely transporting credentials?

  A. PEAP-EAP-MSCHAPv2
  B. EAP-TLS
  C. PEAP-EAP-GTC
  D. EAP-FAST
  E. PEAP-EAP-TLS
  F. EAP-MSCHAPv2
  D. EAP-FAST