Free 4A0-103 Exam Dumps PDF Preview

Question 1

Single choice

Click on the exhibit.

The link between routers R4 and R6 are configured with an admin group "red".

What happens when the LSP is first signaled?

A
The LSP will go through the path R1-R2-R4-R6.
B
The LSP will go through the path R1-R3-R5-R6.
C
The LSP is down because router R1 detects that no path can meet its constraints.
D
The LSP is down because router R4 detects that no path can meet its constraints.

Reveal answer details Close answer details

Correct answerC

Question 2

Single choice

Click on the exhibit.

An LSP path is established on router R1 toward router R6.
If there is a problem on router R4, but the link between R2 and R4 remains up, which of the following will affect the failure detection time?

A
The time router R2 takes to receive a PATH Error message from router R4.
B
The time router R2 takes to find out a number of RSVP Hello messages have been missed.
C
The time router R2 takes to send a PATH Tear message to the head-end router.
D
The time router R2 takes to receive a PATH message from router R4 after a PATH refresh interval.

Reveal answer details Close answer details

Correct answerB

Question 3

Single choice

If an LSP needs to use an admin group, which of the following configurations is NOT required on the Alcatel-Lucent 7750 SR?

A
Assign an admin group to a MPLS interface.
B
Configure CSPF on the LSP.
C
Configure at least one strict hop on the LSP path.
D
Configure an "include" or "exclude" statement on the LSP path.

Reveal answer details Close answer details

Correct answerC

Question 4

Single choice

An LSP path is configured as follows:
- Shared-explicit reservation style
- Make-before-break (MBB) enabled
- 500Mpbs bandwidth reserved on a 1Gbps link

With 100Mbps of unreserved bandwidth remaining, the operator increases the LSP-path's bandwidth reservation to 900Mbps.

What happens to the existing LSP?

A
CSPF looks for the delta bandwidth, taking down the first path if necessary.
B
CSPF looks for the delta bandwidth, implementing make-before-break.
C
After 5 failed attempts to find the bandwidth requested, the head end disables the LSP.
D
CSPF looks for the entire bandwidth requested, implementing MBB.

Reveal answer details Close answer details

Correct answerB

Question 5

Single choice

Which of the following commands is used to display the database containing the OSPF-TE LSAs?

A
show router ospf opaque-database
B
show router ospf database
C
show router ospf opaque-Isa
D
show router ospf te opaque

Reveal answer details Close answer details

Correct answerA

Question 6

Single choice

Click on the exhibit button below. Assume the following:

- The protected path is R1-R2-R3-R6.
- Fast reroute one-to-one protection is enabled.

If the original LSP already has two labels, and router R2 has failed, how many labels will there be in packets on the detour path?

A
1
B
2
C
3
D
4

Reveal answer details Close answer details

Correct answerB

Question 7

Single choice

Which of the following is TRUE when the explicit null is implemented?

A
The penultimate router will forward packets to the eLER, based on the IP header.
B
The eLER will receive packets with a top label value of 0.
C
The eLER will receive packets with a top label value of 3.
D
The penultimate router will pop the top label from the packets.

Reveal answer details Close answer details

Correct answerB

Question 8

Single choice

Which of the following devices inspects the MPLS header in the received packet, and exchanges it for a new MPLS header?

A
iLER
B
LER
C
LSR
D
PE
E
eLER

Reveal answer details Close answer details

Correct answerC

Question 9

Multiple choice

Click on the exhibit button below.

Consider the following:

Routers R1 and R4 are in Area 1.
Routers R4 and R5 in Area 0.
Routers R5 and R3 are in Area 2.

To support LDP-over-RSVP tunnels between routers R1 and R3 over path R1-R4-R5-R3, with which routers will router R5 require targeted sessions? (Choose two)

A
Router R1
B
Router R4
C
Router R2
D
Router R3

Reveal answer details Close answer details

Correct answersB, D

Question 10

Single choice

Which of the following statements best defines an LSP?

A
An LSP is a bidirectional path across the MPLS domain.
B
An LSP is a bidirectional path for a particular FEC across the MPLS domain.
C
An LSP is a unidirectional path across the MPLS domain.
D
An LSP is a bidirectional path between adjacent LSRs.
E
An LSP is a unidirectional path between adjacent LSRs.

Reveal answer details Close answer details

Correct answerC

Question 11

Single choice

Which of the following statements regarding admin groups is FALSE?

A
Admin groups can be configured using the command "configure>router>mpls>admin-group".
B
CSPF uses the information defined by admin groups when paths are computed for constraint-based LSPs.
C
By default, interfaces for which MPLS has been enabled are in the default admin group.
D
A LSP can make use of admin groups for constraint-based path calculations by including or excluding the admin group

Reveal answer details Close answer details

Correct answerC

Question 12

Single choice

A targeted-LDP session may exist between directly connected or non-directly connected devices

A
TRUE
B
FALSE

Reveal answer details Close answer details

Correct answerA

Question 13

Single choice

In MPLS, at which device are packets assigned to a FEC?

A
LSR
B
LER
C
eLER
D
iLER
E
CE

Reveal answer details Close answer details

Correct answerD

Question 14

Single choice

Click on the exhibit.

An LSP traverses R1-R2-R3-R6 and one-to-one fast reroute is enabled.
If the protected LSP transports two labels, and router R2 has failed, how many labels will be on the detour path?

A
1
B
2
C
3
D
4

Reveal answer details Close answer details

Correct answerB

Question 15

Multiple choice

Which of the following message types does RSVP use to set up an LSP? (Choose two)

A
Path message
B
iLER message
C
Resv message
D
LSP setup call request
E
eLER message

Reveal answer details Close answer details

Correct answersA, C

Question 16

Single choice

In MPLS, how is the label range 0 ?
15 used?

A
Static LSPs
B
Reserved use
C
Vendor proprietary use
D
Management LSPs
E
Dynamic LSPs

Reveal answer details Close answer details

Correct answerB

Question 17

Single choice

Which of the following is NOT a characteristic of MPLS?

A
It provides the ability to establish connection oriented paths over a connectionless IP network.
B
It provides a mechanism to engineer network traffic patterns independently of IP routing tables.
C
It will work over most physical layer protocols.
D
It can use GRE tunnels to transport data from many different protocols over an IP network.

Reveal answer details Close answer details

Correct answerD

Question 18

Single choice

Which of the following reservation styles can be used to prevent both the primary and secondary paths from booking resources on a common link?

A
Fixed filter
B
Shared explicit
C
Standby explicit LSP
D
Preemptive filter
E
Link capacity filter

Reveal answer details Close answer details

Correct answerB

Question 19

Single choice

Which of the following about LDP-over-RSVP is TRUE?

A
RSVP LSPs must exist between each PE-ABR pair, or ABR-ABR pair in each area.
B
When LDP-over-RSVP is active, the LDP prefixes are resolved to a physical egress interface.
C
Targeted sessions must exist between all routers along the tunnel path.
D
Link LDP sessions must exist between each ABR-ABR pair in each area.

Reveal answer details Close answer details

Correct answerA

Question 20

Single choice

Click on the exhibit.

All links have 1Gbps unreserved bandwidth initially and Shared Explicit reservation style is used.
After the LSP's primary and standby secondary paths are signaled, how much unreserved bandwidth is left on the links?

A
R1-R2 will have 300Mbps left and R2-R4 will have 400Mbps left.
B
R1-R2 will have 400Mbps left and R2-R4 will have 400Mbps left.
C
R1-R2 will have 600Mbps left and R2-R4 will have 600Mbps left.
D
R1-R2 will have 300Mbps left and R2-R4 will have 600Mbps left.

Reveal answer details Close answer details

Correct answerC

Question 21

Single choice

Which of the following regarding MPLS label value assignment is FALSE?

A
Label values may be dynamically assigned by LDP.
B
Label values may be dynamically assigned by RSVP-TE.
C
Label values may be reserved for special uses.
D
Label values may be dynamically assigned by IGP.

Reveal answer details Close answer details

Correct answerD

Question 22

Single choice

Fill in the blanks: The device at the beginning of an LSP is referred to as the_________, and the device at

the end of an LSP is referred to as the ___________.

A
PE, P
B
LER, LSR
C
LSR, LER
D
iLER, eLER
E
eLER, iLER
F
P, PE

Reveal answer details Close answer details

Correct answerD

Question 23

Single choice

Router R4 originates 500 RSVP signaled LSPs with default hello and refresh timer settings If the only downstream communication fails (link is operationally UP), how long will RSVP wait before it declares the RSVP sessions down?

A
3000ms
B
9000ms
C
30000ms
D
120000ms

Reveal answer details Close answer details

Correct answerB

Question 24

Single choice

Which of the following regarding the location of an MPLS label is FALSE?

A
The MPLS label value may be carried in an ATM header.
B
The MPLS label value may be carried in a shim header.
C
The MPLS label value may be carried in an OSPF header.
D
The MPLS label value may be carried in a Frame Relay header.

Reveal answer details Close answer details

Correct answerC

Question 25

Multiple choice

Which of the following are characteristics of ECMP LSPs in LDP? Choose three answers

A
Liberal label retention mode
B
T-LDP enabled with peers to which load balancing is desired.
C
ECMP enabled in the config>router context.
D
Hashing used to select the egress label.
E
Export policy applied to advertise multiple labels for a given FEC.

Reveal answer details Close answer details

Correct answersA, C, E

Question 26

Single choice

Which of the following about Type 10 opaque LSAs is TRUE?

A
Type 10 opaque LSAs are supported by IS-IS.
B
Type 10 opaque LSAs are flooded to all areas of the routing domain.
C
Type 10 opaque LSAs are stored in an LSDB.
D
Type 10 opaque LSAs are used for traffic engineering support.

Reveal answer details Close answer details

Correct answerD

Question 27

Single choice

Which mode does the following statement describe? An LSR will advertise a label mapping immediately, without waiting for a label mapping from the FEC's next-hop.

A
Liberal label retention mode
B
Conservative label retention mode
C
Ordered control mode
D
Independent control mode

Reveal answer details Close answer details

Correct answerD

Question 28

Multiple choice

Which of the following prerequisites must you configure on a router to enable LDP-over-RSVP support? (Choose two)

A
Configure the T-LDP peers for tunneling.
B
Configure tunneled T-LDP sessions between PE routers.
C
Enable Idp-over-rsvp in the IGP configuration on the PEs and ABRs
D
Enable LSP stitching on the RSVP LSPs

Reveal answer details Close answer details

Correct answersA, C

Question 29

Single choice

Click on the exhibit.

When router R1 forwards a PATH message to router R2, which of the following about the PATH message's IP header is TRUE?

A
The options field is set to router alert.
B
The source address is R1's egress interface address.
C
The destination address is R2's ingress interface address.
D
The HOP object includes R2's system address.

Reveal answer details Close answer details

Correct answerA

Question 30

Single choice

Which of the following about Fast Reroute link protection tunnels is FALSE?

A
Link protection tunnels are established if a router is unable to establish node protection tunnels.
B
Link protection tunnels are only requested for a primary LSP path.
C
Link protection tunnels can be created for both one-to-one or facility Fast Reroute.
D
Link protection tunnels detour around a failed next downstream router.

Reveal answer details Close answer details

Correct answerD

Question 31

Multiple choice

Which of the following conditions must a router meet for an LSP path's RSVP session to exist? Choose two answers

A
The router must build the Path State Block (PSB).
B
The router must build the Reservation State Block (RSB).
C
The router must build the Session State Block (SSB)
D
The router must send the second RESV refresh message.
E
The router must receive the second PATH refresh message.

Reveal answer details Close answer details

Correct answersA, B

Question 32

Single choice

Which of the following best describes constraint-based routing?

A
A mechanism that implements opaque LSAs.
B
A mechanism that computes routes based on defined user requirements.
C
A mechanism that allows the IGP shortest path to be used.
D
A mechanism that allows RSVP or LDP signaling to use a route other than the IGP best route to establish a LSP.

Reveal answer details Close answer details

Correct answerB

Question 33

Single choice

Which of the following statements regarding the last two octets of the LDP identifier is true?

A
It is always a random 16-bit number.
B
It is always zero for per-interface label space.
C
It is always non-zero.
D
It is always zero for per-platform label space.
E
It is always non-zero for per-platform label space.

Reveal answer details Close answer details

Correct answerD

Question 34

Single choice

Click on the exhibit.

Router R2 advertises the aggregate prefix 10.10.10.0/24 into Area 1.

Why would LDP aggregate-prefix- match be enabled on router R3?

A
To reduce the number of LDP sessions
B
To reduce the number of LIB and LFIB entries
C
To bypass the LDP exact prefix match rule
D
To export summarized routes from OSPF to LDP

Reveal answer details Close answer details

Correct answerC

Question 35

Single choice

Click on the exhibit.

Given the output below, which of the following is FALSE?

A
A packet arriving with label 131066 will be forwarded out interface 1 /1 /4 with label 131070.
B
The router is an egress router for FEC 10.10.10.221/32.
C
There are multiple LSPs to reach FEC 10.10.10.244/32.
D
The router's system address is 10.10.10.242/32.

Reveal answer details Close answer details

Correct answerD

Question 36

Single choice

A router has two admin groups defined (GREEN=1 and RED=3). An interface is associated to both admin groups.

What value will be shown in the Admin Group sub-TLV for this interface?

A
0x4
B
0x5
C
0x10
D
0xa

Reveal answer details Close answer details

Correct answerD

Question 37

Single choice

Which of the following is NOT an application of MPLS?

A
Enabling VPNs
B
Enabling traffic engineering
C
Enabling network security
D
Enhancing network resiliency

Reveal answer details Close answer details

Correct answerC

Question 38

Single choice

Which of the following about the Alcatel-Lucent 7750 SR command "own Isp-trace" is FALSE?

A
The MPLS TTL values are incremented at each request.
B
The router uses MPLS Echo Request packets that are IP-routed.
C
The router collects hop information along the tunnel's path.
D
The router performs an unidirectional LSP test.

Reveal answer details Close answer details

Correct answerB

VOL	TYPE	QUESTIONS
1	Single choice	33
2	Multiple choice	5