默认题库 - CCNP(642-845)

单选题

The Acme company has determined that during its busiest hours， the average number of internal VoIP calls across the WAN link is four （4）. Since this is an average， the WAN link has been sized for six （6） calls with no call admission control. What will happen when a seventh call is attempted across the WAN link？（）

A. the seventh call is routed via the PSTN
B. the call is denied and the original six （6） calls remain
C. the call is completed and the first call is dropped
D. the call is completed， but all calls have quality issues
E. the call is completed but the seventh call has quality issue

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单选题

In a VoIP network， which type of interface would an analog fax machine connect to？（）

A. Type 1
B. Type 2
C. FXS
D. FXO
E&M

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多选题

Which statement is true about the comparison of voice traffic with video traffic？（）

A. video conferencing traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows
B. latency requirements are less stringent for video traffic than for voice traffic
C. video traffic is less sensitive to dropped packets than for voice traffic
D. video traffic requires the retransmission capabilities of TCP whereas voice uses UDP
E. video traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows
F. voice traffic requires the retransmission capabilities of TCP whereas video uses UDP

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多选题

For which two types of applications can the SDM provide wizards？（）

A. security services
B. TACACS+services
C. Mpls services
D. Routing services
E. Ppp0e services
F. Poe service

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多选题

Which two statements about the diffserv model are true？（）

A. a class can be inentified as a single application .multiple applications with similar service nees.or be based on the source or destination ip addresses.
B. a drawback of the diffserv model is that it does not provide backward compatibility with devices that can only use the tos field.
C. diffserv uses the diffserv field in the MAC header to mark frames into behavior aggregates（BAs）
D. the diffserv field occupies the same eight bits of the mac header that were previously used for the tos field.
E. the first six high-order bits of the diffserv field are used to identify the resource reservation protocol（RSVP） value .
F. the primary goal of diffserv is scalabilty.

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多选题

Which three characteristics of the traffic flow are taken into consideration when the OoS-for-VPNs feature （OoS pre-classify） provides packet classification and applies appropriate OoS 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

Which statement is true about the configuration of AutoQoS on a Frame Relay interface？（）

AutoQoS can be configured from a different subinterface if the DLCI is already assigned to one subinterface
B. Multilink PPP (MLP) over Frame Relay must be manually configured on low speed DLCIs
C. for low-speed Frame Relay DLCIs with Frame Relay-to ATM interworking, the AutoQoS cannot be configured if a virtual template is already configured for the DLCI
D. AutoQoS can be configured on a Frame Relay DLCI only if a map class is attached to the DLCI&e

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多选题

In a VoIP network， which three call signaling protocols are supported by the Cisco CallManager for call setup， call maintenance， and call teardown？（）

A. H323
B. UDP
C. RTP
D. TCP
E. Media Gateway Control Protocol (MGCP)
F. session initiation protocol (SIP)&e

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多选题

Which two QoS classification and marking statements are true？（）

A. In a Frame Relay network， delay sensitive traffic is tagged with the discard eligible （DE） bit.
B. In an MPLS network， the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP field
C. In an MPLS network， the MPLS EXP bits are used to identify up to 16 CoS values.
D. The differentiated services code point （DSCP） field consists of the first three bits of the IP precedence field in the header of an IP packet.
E. The 802.10 standard uses a three bitfield referred to as the user priority bits （PRI） to mark packets as belonging to a specific Co

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多选题

Which two statements or sets of statements are true about the application of the qos pre-classify command？（）

A. If the classification policy is based upon the ToS byte， the qos pre-classify command is required because the ToS byte only appears in the inner IP header.
B. The ToS byte is copied to the outer header by default. Therefore， the qos pre-classify command is not necessary.
C. With GRE encapsulation， the qos pre-classify command is applied on the tunnel interface. This practice allows for different OoS configurations on each tunnel.
D. With GRE encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.
E. With IPsec encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.

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In a VoIP network， which type of interface would an analog fax machine connect to？（）

Which statement is true about the comparison of voice traffic with video traffic？（）

For which two types of applications can the SDM provide wizards？（）

Which two statements about the diffserv model are true？（）

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

Which statement is true about the configuration of AutoQoS on a Frame Relay interface？（）

In a VoIP network， which three call signaling protocols are supported by the Cisco CallManager for call setup， call maintenance， and call teardown？（）

Which two QoS classification and marking statements are true？（）

Which two statements or sets of statements are true about the application of the qos pre-classify command？（）

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