Testking cisco 642-891
Vendor: cisco
Exam Code: 642-891
Exam Name: CCNP’s Composite Exam (CCNP )
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642-891 Q & A with Explanations + 642-891 Study Guide + 642-891 Preparation Labs
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Question: 6
What are three benefits of the Wireless LAN Solution Engine (WLSE)? (Choose three.)
A – The decentralized nature of WLSE helps reduce the time and resources that are required to
manage a large number of WLAN devices.
B – WLSE helps simplify large-scale deployments by providing automatic configuration of new
APs.
C – WLSE minimizes security vulnerabilities by providing security policy misconfiguration alerts
and rogue AP detection.
D – WLSE provides AP utilization and client association reports, features which help with capacity
planning.
E – WLSE can respond to required changes that are requested by APs.
F – WLSE increases productivity through customization with three possible levels of management:
lightweight, extended, and advanced.
Answer: B, C, D
Question: 7
What is link fragmentation and interleaving (LFI)?
A – LFI is a QoS mechanism that allots bandwidth and enables the differentiation of traffic
according to a policy.
B – LFI is a Layer 2 technique in which header information is sent only at the beginning of the
session, stored in a dictionary, and then referenced in later packets by a short dictionary
index.
C – LFI is a Layer 3 technique in which header information is sent only at the beginning of the
session, stored in a dictionary, and then referenced in later packets by a short dictionary
index.
D – LFI is a Layer 2 technique in which large frames are broken into small, equal-sized fragments,
and transmitted over the link in an interleaved fashion.
E – LEI is a Layer 2 technique in which smaller fragments are combined into large, equal-sized
frames, and transmitted over the link in an interleaved fashion.
Answer: D
Question: 8
Which two statements about packet marking at the data link layer are true? (Choose two.)
A – Through the use of DE markings, Frame Relay QoS supports up to 10 classes of service.
B – Frames maintain their class of service (CoS) markings when transiting a non-802.1p link.
C – IEEE 802.1p supports up to 10 class of service (CoS) markings.
D – In an 802.1q frame, the 3-bit 802.1p priority field is used to identify the class of service (CoS)
priority.
E – The 802.1p CoS markings are preserved through the LAN, but are not maintained end to end.
Answer: D, E
Question: 9
Which two Cisco AutoQoS interface statements are true? (Choose two.)
A – AutoQoS is supported on Frame Relay multipoint subinterfaces.
B – AutoQoS is supported on low-speed ATM PVCs in point-to-point subinterfaces.
C – AutoQoS is supported on serial PPP and HDLC interfaces.
D – AutoQoS is supported only on Frame Relay main interfaces and not on any subinterface
configuration.
Answer: B, C
Question: 10
Which two wireless security statements are true? (Choose two.)
A – A TACACS+ server is required to implement 802.1x.
B – MIC protects against man-in-the-middle and replay attacks.
C – The 802.1x standard provides encryption services for wireless clients.
D – The AES (symmetric block cipher) is specified in the IEEE 802.11i specification.
E – The IEEE 802.11i specification uses RC4 as its encryption mechanism.
F – WPA requires TKIP and AES as encryption methods.
Answer: B, D
Testking 642-891
Questions and Answers : 159 Q&As
Updated: 2008-12-12
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