Question 1

Which of the statements about packet classification is TRUE?

Accepted Answer

A)   It sets the destination IP address of the packet.
B)   It uses RVSP to inform other QoS capable routers how the packet should be treated.
C)   It sets the TOS, DSCP, EXP, or DOT1p field based on classification criteria.
D)   It can use a customer's encapsulated data to determine a packet's forwarding class. C

Question 2

On an Alcatel-Lucent IOM 3, how is buffer memory allocated per forwarding complex?

Accepted Answer

A)   512 MB ingress, 512 MB egress
B)   256 MB ingress, 256 MB egress
C)   1 GB dynamically allocated between ingress and egress.
D)   768 MB dynamically allocated between ingress and egress.
E)   768 MB, with a minimum of 256 MB ingress and egress, and an additional 256 MB dynamically allocated. D

Question 3

Click the exhibit button below. Given the SAP-ingress policy, which of the following statements are TRUE? (Choose three)

Accepted Answer

A)   All AF traffic will be marked "in-profile" at the SAP-ingress.
B)   All TCP traffic will be mapped to forwarding class EF.
C)   UDP traffic is placed in queue 3 while ICMP traffic is placed in queue 5.
D)   EF traffic will receive higher scheduling priority than H2 traffic.
E)   Traffic that does not match any of the IP criteria will be placed in queue 3. A,D,E

Question 4

What is the maximum number of SAP-ingress policies that can be applied on a SAP?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F)  8

Question 5

If two queues complete for bandwidth in a hierarchical scheduler environment, which parameter is used by their parent scheduler to determine the priority with which each queue can use bandwidth above its committed rate?

Accepted Answer

A)   level
B)   cir-level
C)   weight
D)   cir-weight

Question 6

With hierarchical scheduling, up to ___________ tiers are supported on the Nokia 7750 SR.

Accepted Answer

A)   8
B)   3
C)   4
D)   5
E)   6

Question 7

Click the exhibit button below. Given the SAP-ingress policy, which of the following statements are FALSE? (Choose three)

Accepted Answer

A)   Queue 5 is using priority mode.
B)   UDP traffic can be serviced at a maximum rate of 20 Mbps.
C)   Ping traffic is place in queue 5.
D)   Queues 5 and 6 will receive equal portions of any remaining available bandwidth to meet their above-CIR bandwidth requirements.
E)   Queue 3 is scheduled before queue 5.

Question 8

The IP ToS field consists of ________ bits, of which ________are used. The _________most significant (first) bits define precedence.

Accepted Answer

A)   8, 6, 3
B)   8, 8, 6
C)   16, 8, 4
D)   8, 6, 4
E)   24, 16, 8

Question 9

Which of the following statements about buffer admission control techniques is FALSE?

Accepted Answer

A)   A packet is accepted into a queue based on its priority and forwarding class.
B)   Buffer admission control limits the number of out-of-profile packets that enter the queue.
C)   Both high priority-only buffer space and WRED can be used in a queue.
D)   Priority is used when a packet enters a SAP-ingress queue.

Question 10

According to the configuration shown above, which of the following about the classification and marking of self-generated BGP traffic is TRUE?

Accepted Answer

A)   It will be marked as DSCP BE and classified into forwarding class BE.
B)   It will be marked as DSCP NC1 and classified into forwarding class BE.
C)   It will be marked as DSCP NC1 and classified into forwarding class NC.
D)   It will be marked as DSCP NC1 and classified into forwarding class AF.

Question 11

When using an egress port scheduler, on which scheduling loop are orphaned queues serviced?

Accepted Answer

A)   Level 8 within CIR.
B)   Level 8 between CIR and PIR.
C)   Level 8, once all PIR is serviced.
D)   Level 1 within CIR.
E)   Level 1 between CIR and PIR.F)  Level 1, once all PIR is serviced.

Question 12

Which of the following statements about the token buckets of a policer is FALSE?

Accepted Answer

A)   The CIR has no influence on the forwarding rate of the policer traffic.
B)   The CIR influences whether a packet is considered high-profile or low-profile.
C)   The policer discards all incoming packets when PIR bucket reaches the MBS level.
D)   PIR bucket forwards packets that arrive with rates above PIR as out-of-profile.

Question 13

Which parameter can be configured in a network ingress QoS policy?

Accepted Answer

A)   The priority (low/high)  to be assigned to the packets.
B)   The profile (in/out)  to be assigned to the packets.
C)   The queues to be assigned to the forwarding classes.
D)   The markings to be marked on the packets.

Question 14

Which of the following entities can scheduler policies be applied to? (Choose two)

Accepted Answer

A)   Network ingress port
B)   Epipe ingress SAP
C)   ES egress SAP
D)   Ingress MDA
E)   VPRN ingress interfaceF)  Shared buffer space

Question 15

A queue-group template can contain both queues and policers when applied under which conditions?

Accepted Answer

A)   When applied at the port level for access ingress.
B)   When applied at the FP (Forwarding Pass)  level for access ingress.
C)   When applied at the FP (Forwarding Pass)  level for network ingress.
D)   When applied at the port level for network egress.

Question 16

Click the exhibit button below.  Based on the configuration of the network policy (below), what will be the forwarding class associated with a MPLS encapsulated customer packet that arrives on a dotlQ encapsulated network port 1/1/4:1 on P1 with the following characteristics: EXP value = 6 DSCP value = cs1 Dot1pvalue = 3

Accepted Answer

A)   EF
B)   H1
C)   L1
D)   H2
E)   L2

Question 17

Which of the following are characteristics of 802.1p? (Choose two)

Accepted Answer

A)   802.1p adds 16 bits to the Layer 2 header,
B)   802.1p adds 16 bits to the Layer 3 header.
C)   802.1p specifies 64 different priority levels.
D)   802.1p uses a field in the 802.1Q header.
E)   802.1p uses a field in the Layer 3 IP headerF)  802.1p defines a 3-bit Class of Service field.

Question 18

Click the exhibit button below. A network operator has configured a network-queue policy to map forwarding classes to queues, as shown in the exhibit below. Based on the default scheduling behavior of the Alcatel-Lucent 7750 SR, in which order will packets be serviced?

Accepted Answer

A)   All in-profile packets in round-robin, then all out-of-profile packets in biased round-robin.
B)   In-profile EF packets, then in-profile H2 packets, then in-profile AF packets, then out-of-profile EF packets, then out-of-profile H2 and AF packets, and then out-of-profile BE packets.
C)   In-profile EF, H2 and AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.
D)   In-profile EF packets, then in-profile H2 and AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.
E)   In-profile EF and H2 packets, then in-profile AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.

Question 19

Which of the following statements BEST describes where shaping mechanisms should be applied?

Accepted Answer

A)   On all ports on the Nokia 7750 SR.
B)   At the junction of high-speed to low-speed links or at places of traffic aggregation.
C)   At the junction of low-speed to high-speed links or at places of traffic aggregation.
D)   On low-speed WAN links.
E)   Nowhere. Shaping is only performed in hardware and serviced in a round-robin.

Question 20

Click the exhibit button below.  Based on the configuration shown below, name the forwarding class to be associated with a TCP packet encapsulated inside an Ethernet frame that arrives on SAP 1/1/5 with the following characteristics: Destination IP address = 120.110.1.1 TCP port number = 23 DSCP value = nc1 Dot1pvalue = 3

Accepted Answer

A)   H2
B)   NC
C)   L2
D)   EF
E)   H1F)  BE

Exam 1: Nokia Scalable IP Networks