4A0-105 Exam Questions
154 real 4A0-105 exam questions with expert-verified answers and explanations. Page 1 of 4.
- Question #1
Two management VPLSs have been created. mVPLS 1 and mVPLS 2. Two user VPLS services exist. uVPLS 10 and uVPLS 20. What command can be used to determine which management VPLS is man...
- Question #2
How is the Primary Bridge chosen in a VPLS?
- Question #3
What is the name of the feature supported on the Alcatel-Lucent 7750 SR that prevents MAC explosion in large VPLS deployments?
- Question #4
Redundant spoke-SDPs are used between 2 Metro networks for redundancy. How can load balancing be achieved across the redundant spoke-SDPs?
- Question #5
What is the default remote-age timer of a B-VPLS?
- Question #6
Click on the exhibit below. The VPLS service MTU on R2 is 1514 bytes. What must the service MTU be on all other routers participating in the VPLS?
- Question #7
What are the advantages of running a physical ring topology with a mesh of mesh-SDPs? (Choose 2)
- Question #8
What is the SA in the Ethernet frame used for by a layer 2 switch?
- Question #9
Which OAM tool can be used to dynamically learn the MAC address of a CE device connected to a SAP within a VPLS service?
- Question #10
When spanning tree is enabled within a VPLS service and the STP mode is 802.1 D 2004 what happens if a PVST BPDU is received on a SAP?
- Question #11
Click on the exhibit below. If the SDP between R2 and R1 goes down, what devices will be reachable from R2 through the VPLS?
- Question #12
Fill in the blank for this next sentence. Flooded traffic received on any ____________in the service is replicated to other spoke SDPs and SAPs and not transmitted on any mesh SDPs...
- Question #13
Assuming TLDP and RSVP are both being used in an MPLS network core which of the following statements is true?
- Question #14
What is the default fdb size for a VPLS service?
- Question #15
Which of the following technologies allows for two explicit VLAN tags to be received from a customer device?
- Question #16
What is the default service-mtu for a VPLS service?
- Question #17
In Active/Standby pseudowires a failed pseudowire has recovered. Under what circumstances will the active pseudowire revert to the previously failed link?
- Question #18
What are the limitations of a traditional layer 2 switch? (Choose 3}
- Question #19
If the command "disable-learning" has been added at the VPLS level, then MAC entries which have already been learned will not be aged.
- Question #20
MAC explosion is best described as a large amount of MAC addresses being withdrawn and relearned?
- Question #21
Click on the exhibit below. Study the diagram shown. What consideration should be given to the transport tunnel of SDP 300?
- Question #24
Which of the following describes the scope of the IEEE 802.3ah EFM standard? (Choose 3)
- Question #25
During the process of troubleshooting a VPLS problem the "oam mac-purge" command with "register" option was used to purge a MAC address from the FDB. Which of the following stateme...
- Question #26
Click on the exhibit below. Based on the output below which of the following statements is true?
- Question #27
Which element of IEEE 802.1ag is responsible for initiating CFM messages?
- Question #28
Click on the exhibit below. Assume PE-1 has a mesh-sdp configured to every PE node in both Metro networks. What could be done to prevent the bandwidth replication between Metro 1 a...
- Question #29
Click on the exhibit below. Which bridge will become the root bridge?
- Question #30
Why are provisioning requirements a factor that influence VPLS design? (Choose 2)
- Question #31
Click on the exhibit below. How many LSPs are required in total between Metro A and Metro B if 100 hierarchical VPLS services are deployed across the two metro networks?
- Question #32
Click on the exhibit below. The following VPLS services and SAPs have been configured. Which of the following statements is true?
- Question #33
When a PE node receives a PBB encapsulated frame on a B-VPLS, how does the PE determine which l-VPLS it belongs to?
- Question #34
Which of the following statements is false?
- Question #35
Port 1/1/1 has been configured as an access port with QinQ encapsulation. Which of the following three statements are true for ingress traffic assuming default configuration? (Choo...
- Question #36
If the max remote-age timer of a B-VPLS is reached, what happens to the remotely learned MAC addresses in the l-VPLS service?
- Question #37
How do user VPLSs become associated with a management VPLS for redundant spoke- sdp connections?
- Question #38
Why is MAC explosion a factor to be considered when designing a large VPLS network? (Choose 2)
- Question #39
How can one ensure that a specific switch will be select as root in an STP network?
- Question #40
Click on the exhibit below. Based on the output below which of the following statements is true? (Choose 2)
- Question #41
What scaling factors should a network engineer be aware of when designing VPLS networks? (Choose 3)
- Question #42
Which of the following statements relating to VPLS is false?
- Question #43
What are the benefits of a hierarchical VPLS architecture? (Choose 3)
- Question #44
Which of the following statements is true?
- Question #45
Click on the exhibit below. Assume there are two VPLS services configured on the MDU. How could load-balancing be achieved when using Active/Standby pseudowires?
- Question #46
IEEE 802.3ah is similar to SONET/SDH in that it can count and report bit errors and frame errors.
- Question #47
Click on the exhibit below. A new site is added to PE-D of Metro B. Which of the following statement below is true?
- Question #48
Which protocol is used to signal the status of the active links between the PE and the CE in MC- LAG?
- Question #49
How does the IEEE 802.1ag loopback function differently from the loopback feature in 802.3ah? (Choose 2)
- Question #50
MC-LAG is only supported on network ports.
- Question #51
Which of the following statements about Spanning Tree Protocol is true?
- Question #52
Click on the exhibit below. Assume a CE router is connected to the SAP of each PE. The arp cache of all CE routers is empty and the FDB for VPLS 300 is empty. The CE router connect...