默认题库 - CCNP(642-892)

单选题

Which statement is true about IP telephony calls？（）

A Voice over IP （VoIP） packet consists of the voice payload， IP header， TCP header， RTP header， and Layer 2 link header.
B. The voice carrier stream uses H323 to set up， maintain， and tear down call endpoints.
Call control signaling uses Real-Time Transport Protocol （RTP） packets that contain actual voice samples.
D. The sum of bandwidth necessary for each major application， including voice， video， and data， should not exceed 75 percent of the total available bandwidth for each link.

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多选题

Which three statements are true about the voice VLAN feature on a Catalyst 2950 switch？（Choose three.）（）

A. The CoS value is trusted for 802.1p or 802.1q tagged traffic.
B. The voice VLAN feature is disabled by default.
C. The IP phone accepts the priority of all tagged and untagged traffic and sets the CoS value to 4.
D. When the voice VLAN feature is enabled， all untagged traffic is sent according to the default CoS priority of the port.
E. PortFast is automatically disabled when a voice VLAN is configured.
F. The default CoS value for incoming traffic is set to 0.

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单选题

Which issue or set of issues does the Lightweight Access Point Protocol （LWAPP） address？（）

A. reduction of processing in wireless controllers
B. distributed approach to authentication， encryption， and policy enforcement
C. provides security by blocking communication between access points and wireless clients
D. access point discovery， information exchange， and configuratio

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多选题

What are two rules for compacting IPv6 addresses？（）

A. The maximum number of times a double colon can replace a 16-bit segment that consists of all zeroes is two
B. The leading zeroes in any 16-bit segment do not have to be written.
C. Every 16-bit segment that consists of all zeroes can be represented with a single colon
D. The trailing zeroes in any 16-bit segment do not have to be written.
E. Any single， continuous string of one or more 16-bit segments that consists of all zeroes can be represented with a double colon
F. Two zeroes in the middle of any 16-bit segment do not have to be writte

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单选题

What is the difference between the IPv6 addresses ：：/0 and ：：/128？（）

A. ：：/0 is the unspecified address， and ：：/128 is the multicast address
B. ：：/0 is the unicast address， and ：：/128 is the anycast address
C. ：：/0 is the unicast address， and ：：/128 is the multicast address
D. ：：/0 is the anycast address， and ：：/128 is the multicast address
E. ：：/0 is the default route， and ：：/128 is the unspecified address
F. ：：/0 is the anycast address， and ：：/128 is the default addre

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多选题

Which two statements are true about voice VLANs？（）

A. Voice VLANs are only used when connecting an IP phone and a host to distinct switch ports
B. Access ports that are configured with voice VLANs will always trust the CoS that is received from IP phones
C. Access ports that are configured with voice VLANs may or may not override the CoS value that is received from an IP phone
D. Voice VLANs are configured using the switchport voice vlan vlan-ID interface configuration command
E. Voice VLANs provide a trunking interface between an IP phone and an access port on a switch to allow traffic from multiple devices that are connected to the port
F. Enabling Voice VLAN on a switch port will automatically configure the port to trust the incoming CoS marking

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多选题

Which two types of activities does the Lightweight Access Point Protocol （LWAPP） define？（Choose two.）（）

A. access point certification and software control
B. compression and Layer 3 address mapping
C. Layer 3 addressing and distribution
D. packet encapsulation， fragmentation， and formatting
E. SNMP monitoring service

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多选题

Which two statements about the Cisco Aironet Desktop Utility （ADU） are true？（Choose two.）（）

A. The Aironet Desktop Utility （ADU） can be used to establish the association between the client adapter and the access point， manage authentication to the wireless network， and enable data encryption.
B. The Aironet Desktop Utility （ADU） and the Microsoft Wireless Configuration Manager can be used at the same time to configure the wireless client adapter.
C. The Aironet Desktop Utility （ADU） can support only one wireless client adapter installed and used at a time.
D. The Aironet Desktop Utility （ADU） profile manager feature can create and manage only one profile for the wireless client adapter.
E. When the user selects a different profile in the Aironet Desktop Utility （ADU）， the settings for the wireless client adapter are changed only after a reboot.

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单选题

Which statement about the Lightweight Access Point Protocol （LWAPP） protocol is true？（）

A. The processing of 802.11 data and management protocols and access point capabilities is distributed between a lightweight access point and a centralized WLAN controller.
B. LWAPP aggregates radio management forward information and sends it to a wireless LAN solution engine.
C. LWAPP authenticates all access points in the subnet and establishes a secure communication channel with each of them.
D. LWAPP advertises its WDS capability and participates in electing the best WDS device for the wireless LAN

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Which statement is true about IP telephony calls？（）

Which three statements are true about the voice VLAN feature on a Catalyst 2950 switch？ （Choose three.）（）

Which issue or set of issues does the Lightweight Access Point Protocol （LWAPP） address？（）

What are two rules for compacting IPv6 addresses？（）

What is the difference between the IPv6 addresses ：：/0 and ：：/128？（）

Which two statements are true about voice VLANs？（）

Which two types of activities does the Lightweight Access Point Protocol （LWAPP） define？ （Choose two.）（）

Which two statements about the Cisco Aironet Desktop Utility （ADU） are true？ （Choose two.）（）

Which statement about the Lightweight Access Point Protocol （LWAPP） protocol is true？（）

Which three statements are true about the voice VLAN feature on a Catalyst 2950 switch？（Choose three.）（）

Which two types of activities does the Lightweight Access Point Protocol （LWAPP） define？（Choose two.）（）

Which two statements about the Cisco Aironet Desktop Utility （ADU） are true？（Choose two.）（）