默认题库 - CCNP(642-845)

多选题

Which two statements about the Wireless Location Appliance are true？（）

A. a Wireless Location Appliance acts as a server to one or more Cisco WCSs. It collects， stores， and passes on data from its associated Cisco WLAN controllers
B. before using the Web interface， the initial configuration of the Wireless Location Appliance must be done using the command-line interface （CLI）
C. the Cisco 2000， 2700， 4100， and 4400 are examples of Wireless Location Appliance.
D. the Wireless Location Appliance visually displays the location information of WLAN devices and forwards this information to third-party applications using the Simple Network devices and forwards this information to third-party applications using the Simple Network Management Protocol （SNMP）
E. the Wireless Location Appliance visually tracks up to 15，000 WLAN devices and can store this information for 90 days.

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多选题

Which three characteristics of the traffic flow are taken into consideration when the QoS-for-VPNs feature （QoS pre-classify） provides packet classification and applies appropriate QoS service on tunnel interfaces？（）

A. IP precedence bits
B. DSCP bits
C. original port numbers
DE bits
E. source IP address
F. destination IP addre

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单选题

What is the most common cause of network congestion？（）

A. aggregation congestion occurring at the core layer where the different distribution layer devices feed traffic to the core-layer switches
B. speed mismatches when moving from a low-speed LAN environment to a higher speed WAN environment
C. flapping Ethernet interfaces caused by misconfigured LAN interfaces
D. flapping serial interfaces caused by misconfigured WAN interfaces
E. speed mismatches when moving from a high-speed LAN environment to a lower speed WAN environment

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单选题

When QoS levels in the Cisco Wireless Control System （WCS） are entered， which profile names are used to identify the access categories？（）

A. platinum， gold， silver， and bronze
B. voice， gold， silver， and bronze
C. low delay， network critical， business， best effort
D. voice， video， background gold， background silver， and best effort
E. voice， video， best effort， and background
F. voice， video， best effort， background， and scavenger

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多选题

When Cisco SDM is used to generate QoS policy， various QoS classes will be created and assigned a percentage of the interface bandwidth. Which three statements indicate the default bandwidth values that are assigned by SDM for outgoing traffic on a WAN interface？（）

A. Voice traffic will be assigned 47% of the interface bandwidth.
B. Voice call signaling will be assigned 33% of the interface bandwidth.
C. Telnet， SSH， and other traffic that is generated to manage the router is assigned 5% of the interface bandwidth.
D. Best-effort traffic will be assigned 38% of the interface bandwidth.
E. Routing protocol traffic will be assigned 5% of the interface bandwidth.
F. Transactional traffic will be assigned 5% of the interface bandwidth.

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单选题

Which statement is true about Foreign Exchange Station （FXS） ports on a router？（）

A. The FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central office.
B. The FXS interface connects directly to a standard telephone，fax machine，or similar device and supplies ring，voltage，and dial tone.
C. The FXS interface connects directly to an IP phone and supplies ring，voltage，and dial tone.
D. The FXS interface connects directly to ISDN voice channels.

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多选题

Which two statements are true about RSVP and the InServ QoS model？（）

A. a drawback of implementing RSVP is the requirement to migrate to a supporting routing protocol
B. RSVP uses DSCP to signal QoS requirements to routers
C. RSVP is a routing protocol
D. RSVP is an IP protocol that uses IP protocol ID 46， and TCP/UDP ports 3455
E. RSVP specifically provides a level of service for rate-sensitive and delay-sensitive traffic
F. the flow-based approach of RSVP is ideal for large， scalable implementations such as the public internet

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多选题

What are three types of packet delays that occur in a network？（）

A. timing
B. queuing
C. differential
D. serialization
E. packetization
F. propagatio

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单选题

What is true about Quality of Service （QoS） for VPNs？（）

A. QoS preclassification is only supported on generic routing encapsulation （GRE） and IPsec VPNs
B. QoS preclassification is not required in Layer 2 Tunneling Protocol （L2TP）， Layer2 Forwarding （L2F）， and Point-to-Point Tunneling Protocol （PPTP） VPNs
C. QoS preclassification is supported on IPsec AH VPNs， but not on IPsec ESP VPNs
D. the QoS-for-VPNs feature （QoS preclassification） is designed for VPN transport interfaces
E. with IPsec tunnel mode， the type of service （ToS） byte value is copied automatically from the original IP header to the tunnel header

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单选题

Which IOS feature provides dial plan scalability and bandwidth management for H.323 VoIP implementations？（）

A. gatekeeper
B. Call Routing
Call Admission Control
Digital Signal Processor

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Which two statements about the Wireless Location Appliance are true？（）

Which three characteristics of the traffic flow are taken into consideration when the QoS-for-VPNs feature （QoS pre-classify） provides packet classification and applies appropriate QoS service on tunnel interfaces？（）

What is the most common cause of network congestion？（）

When QoS levels in the Cisco Wireless Control System （WCS） are entered， which profile names are used to identify the access categories？（）

When Cisco SDM is used to generate QoS policy， various QoS classes will be created and assigned a percentage of the interface bandwidth. Which three statements indicate the default bandwidth values that are assigned by SDM for outgoing traffic on a WAN interface？ （）

Which statement is true about Foreign Exchange Station （FXS） ports on a router？（）

Which two statements are true about RSVP and the InServ QoS model？（）

What are three types of packet delays that occur in a network？ （）

What is true about Quality of Service （QoS） for VPNs？（）

Which IOS feature provides dial plan scalability and bandwidth management for H.323 VoIP implementations？（）

When Cisco SDM is used to generate QoS policy， various QoS classes will be created and assigned a percentage of the interface bandwidth. Which three statements indicate the default bandwidth values that are assigned by SDM for outgoing traffic on a WAN interface？（）

What are three types of packet delays that occur in a network？（）