Juniper JN0-649 問題集

質問 1：
Which statement is correct about MSTP?
A. MSTP enables dynamic discovery of Layer 2 neighbors.
B. MSTP dynamically manages VLAN registration in a LAN
C. MSTP enables mapping multiple independent spanning tree instances onto one physical topology
D. MSTP uses slacked VLAN tags to extend a Layer 2 Ethernet connection between multiple sites
正解：C

質問 2：
You have applied the CoS configuration shown in the exhibit to an EX4300 switch.
Which two statements are true? (Choose two.)


A. Packets in low priority queues are serviced when strict-high priority queues have no available credits
B. All strict-high priority queues are serviced in a round-robin fashion as long as they have remaining credits
C. Packets in low priority queues transmit only when start-high priority queues are empty
D. All strict-high priority queues are serviced in a round-robin fashion regardless of available credits.
正解：B,C

質問 3：
Which two statements are true about IS-IS levels? (Choose two.)
A. Level 2 systems do not advertise Level 2 routes into a Level area by default.
B. Level 1 systems use a default route to reach AS external routes located in other areas.
C. Level 1 system only from adjacencies with other systems that have different area IDs.
D. Level 2 systems must use the loopback address as a part of the ISO network address.
正解：B

質問 4：
When configuring class of services, what would be you use to allocate bandwidth to a forwarding class?
A. bandwidth
B. transmit rate
C. buffer depth
D. speed
正解：B

質問 5：
Juniper devices use the token bucket algorithm for policing. Which two statements are true regarding the token bucket algorithm? (Choose two.)
A. Policers do not reduce the speed of an interface.
B. Policers transmit streams of traffic at the maximum interface speed until the burst rate is reached.
C. Policers reduce the speed of an interface.
D. Policers enforce gaps between transmitted packets.
正解：A,D

質問 6：
You are deploying IP phones to a customer site. The IP phones will be installed to share a common access port with the user's desktop computer. You are required to provide a mechanism to place user data traffic and voice traffic in different VLANs for class-service application How would you implement this solution?
A. Configure VLAN tagging on the IP phones and use the voice VLAN feature on the access ports to assign lagged frames to the voice VLAN and untagged frames to a data VLAN
B. Configure flexible VLAN tagging on the user ports with the data and voice VLANs as members
C. Configure the IP phones to label voice traffic with the DSCP of code point and apply a BA classifier to the access ports to classify voce traffic
D. Apply a multifield classifier on the access ports that assigns voice packets to the assured forwarding class, based on the IP phone manufacturer's MAC QUI
正解：A

質問 7：
You are asked to configure 802.1X on your access ports to allow only a single device to authenticate. In this scenario, which configuration would you use?
A. single-secure supplicant mode
B. single supplicant mode
C. multiple supplicant mode
D. MAC authentication mode
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 8：
Referring to the exhibit, which statement is true?

A. R1 is a backbone router.
B. R1 is an ASBR.
C. R1 has the B bit set.
D. R1 is an ABR.
正解：B