4A0-107 Practice Exam Questions and Answers

A.  

64

B.  

8

C.  

3

D.  

16

E.  

1

A.  

Packets corresponding to a layer-2 service can be pre-marked on SAP-ingress.

B.  

Packets corresponding to a layer-2 service can be pre-marked on network-ingress.

C.  

Packets corresponding to a layer-3 service can be pre-marked on SAP-ingress.

D.  

Packets corresponding to a layer-3 service can be pre-marked on network-ingress.

A.  

IS-IS

B.  

RSVP

C.  

ICMP

D.  

BGP

A.  

On the network egress port.

B.  

On the SDP.

C.  

On the access ingress port.

D.  

On the egress MD

A.  

E.  

On the SAP.

F.  

On the ingress MD

A.  

A.  

Shapeless policing at SAP-ingress only.

B.  

Shapeless policing at SAP-ingress and egress.

C.  

Biased round robin queuing at ingress only.

D.  

Soft shaping at all network interfaces.

E.  

Soft shaping at network ingress only.

A.  

IntServ uses a protocol like RSVP to provide QoS guarantees on a per-flow basis.

B.  

DiffServ groups multiple microflows into bigger streams called macro flows.

C.  

Intserv requires that network routers allocate resources for thousands of individual flows.

D.  

Diffserv classifies packets into forwarding classes only at the first network hop.

A.  

SAP-ingress only

B.  

SAP-egress only

C.  

SAP-ingress and SAP-egress

D.  

Network ingress

E.  

Network egress

A.  

Packets marked with dscp = af33

B.  

Packets marked with dot1p = 4

C.  

All packets mapped to queue 2 have the same priority to enter this queue.

D.  

There are no packets mapped to queue 2.

A.  

Self-generated

B.  

Real-time

C.  

Best-effort

D.  

Assured

A.  

An egress unicast queue defined in a network queue policy

B.  

An ingress unicast queue defined in a SAP-ingress policy

C.  

An ingress multipoint queue defined in a SAP-ingress policy

D.  

An ingress multipoint queue defined in a network queue policy

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.

A.  

Each network egress port receives its own buffer pool.

B.  

Each SAP-egress port receives its own buffer pool.

C.  

All SAP-ingress ports on the same MDA share a buffer pool.

D.  

All the network ingress ports on the same MDA share a buffer pool.

E.  

Each network ingress port on the same MDA receives its own buffer pool.

A.  

Limiting the maximum forwarding rate of each individual policer and, at the same time, marking, packets as in-profile or out-of-profile.

B.  

Putting packets in a buffer as they are received, and marking packets as in-profile or out-of-profile as they are removed from the buffer.

C.  

Rate-limiting the collective output of several policers, and to reallocate bandwidth that is not utilized by some policers to other policers that need to use it.

D.  

Rate-limiting the collective output of several policers towards each egress FFPC, while maintaining control of the maximum overall forwarding rate.

A.  

WRED monitors the shared buffer space utilization over a period of time.

B.  

WRED disables the TCP slow-start congestion control mechanism.

C.  

WRED uses two configurable slopes for each buffer pool: a high slope and a low slope.

D.  

WRED uses the shared buffer utilization, instead of the individual queue depth, to get a better picture of the average resource utilization of the shared buffer space.

E.  

WRED polices the shared buffer pool and marks all packets above a certain rate as "discard eligible."

A.  

H2

B.  

NC

C.  

L2

D.  

EF

E.  

H1

F.  

BE

A.  

The slope-policy

B.  

The SAP-ingress policy

C.  

The network-queue policy

D.  

The scheduler-policy

E.  

The network-policy

F.  

The WRED-policy

G.  

The arbitrator-policy

A.  

It enables CFHP.

B.  

It more scalable than using policers.

C.  

It allows a separate set of queues/policers for each VLAN on a port.

D.  

It allows a set of queues to be shared among multiple SAPs.

A.  

On the network egress port.

B.  

On the SDP.

C.  

On the access ingress port.

D.  

On the egress MD

A.  

E.  

On the SAP.

F.  

On the ingress MD

A.  

A.  

When queues use shared buffer space, buffers are more efficiently utilized.

B.  

Queues that use reserved buffer space will have memory available for their reserved portion.

C.  

When a queue is not using its reserved portion, other queues can use it.

D.  

Using reserved buffer space prevents a queue from being starved of buffer resources by other queues.

A.  

3

B.  

4

C.  

6

D.  

8

A.  

EF

B.  

H1

C.  

L1

D.  

H2

E.  

L2

A.  

EF, in

B.  

H1, out

C.  

BE, out

D.  

L1, in

A.  

1 multipoint and 8 unicast.

B.  

8 queues, regardless of traffic type.

C.  

8 unicast and 24 multipoint.

D.  

8 unicast and 8 multipoint.

E.  

16 queues, distributed as desired.

A.  

When a packet arrives, the PIR bucket depth is checked and the packet is discarded if this bucket is full.

B.  

The CIR bucket of a policer is the reserved portion of its PIR bucket.

C.  

The CIR bucket of a policer has two thresholds: CBS and HPO.

D.  

Packets processed by the PIR bucket at an average rate above PIR will be forwarded as out-of-profile.

A.  

Queue 3 within-CIR packets, then queue 4 within-CIR packets, then queue 3 and queue 4 above-CIR packets in round-robin.

B.  

Queue 4 within-CIR packets, then queue 3 within-CIR packets, then queue 3 and queue 4 above-CIR packets in round-robin.

C.  

Queue 3 within-CIR packets, then queue 4 within-CIR packets, then queue 3 above-CIR packets, and finally queue 4 above-CIR packets.

D.  

Queue 4 within-CIR packets, then queue 3 within-CIR packets, then queue 4 above-CIR packets, and finally queue 3 above-CIR packets.

A.  

Set the queue’s CBS to 0

B.  

Set the queue’s MBS equal to the CBS

C.  

Set the queue’s high-priority-only equal to the MBS

D.  

Set the queue’s MBS to 0

E.  

Set the queue’s high-priority-only to 0

A.  

The process happens only before the packet goes through the switching fabric.

B.  

The process happens only before the packet goes onto the egress port.

C.  

Marking/remarking the packets is for future classification.

D.  

Marking/remarking the packets will occur right after classification of the packet.

A.  

It may exceed PIR of the queue.

B.  

It may be exceeded by the average servicing rate of the queue.

C.  

It varies depending on the traffic characteristics.

D.  

It is the rate at which packets are forwarded out of the queue.

A.  

The default forwarding class for ICMP traffic is BE and cannot be changed.

B.  

The SAP has been shut down.

C.  

Queue 3 has no PIR or CIR configured, and thus cannot hold any packets.

D.  

The SAP-ingress policy has not been applied to the SAP.

A.  

2

B.  

3

C.  

5

D.  

6

E.  

None of the above.

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 header

F.  

802.1p defines a 3-bit Class of Service field.

A.  

A queue will be serviced as expedited if all of the forwarding classes mapped to it are expedited, regardless of its configured type.

B.  

A queue will be serviced as best-effort if all of the forwarding classes mapped to it are best-effort, regardless of its configured type.

C.  

A queue will be serviced as expedited if at least one of the forwarding classes mapped to it is expedited, regardless of its configured type.

D.  

A queue will be serviced as expedited if its type is configured as expedited, regardless of the forwarding classes mapped to it.

A.  

Policing, expedited

B.  

Metering, marked discard eligible

C.  

Marking, marked discard eligible

D.  

Policing, discarded

E.  

Shaping, discarded

A.  

1st

B.  

8th

C.  

9th

D.  

17th