[Free] Download New Latest (November) Cisco 400-201 Actual Tests 161-170

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QUESTION 161

What does FRTP stand for?

 

A.

Frame Relay Top Pseudowire

B.

Frame Relay Traffic Pseudowire

C.

Frame Relay Traffic Protocol

D.

Frame Relay Traffic Policing

 

Correct Answer: D

Explanation:

Frame Relay Traffic Policing provides a mechanism to rate-limit packets on switched PVCs using a “leakybucket” implementation. When enabled, Traffic Policing prevents traffic congestion by discarding or setting the Discard Eligible (DE) bit on packets that exceed specified traffic parameters. Traffic Policing parameters can be specified per DCE interface, or per switched PVC, using the ‘map class’ mechanisms.

 

 

QUESTION 162

What is used as label in cell-based MPLS?

 

A.

VPI and VCI

B.

None of above

C.

VCI

D.

Specific 4 bytes label

E.

VPI

 

Correct Answer: A

 

 

QUESTION 163

Select the three best answers which best describe Private Network-to Network Interface (PNNI) in an ATM network (Choose three.)

 

A.

It is the Routing protocol used between ATM switches

B.

PNNI uses the same Dijsktra algorithm for SPF calculation

C.

PNNI and OSPF use the same Database to make cohesive decision for packet forwarding

D.

PNNI measures line capacities and delays in addition to simple cost metrics

 

Correct Answer: ABD

Explanation:

The Private Network-to-Network Interface (PNNI) is a link-state routing protocol used in ATM networks. PNNI is similar to the open shortest path first (OSPF) used for IP routing. PNNI is a suite of network protocols that can be used to discover an ATM network topology, create a database of topology information, and route calls over the discovered topology. PNNI is a link-state routing protocol, which means that the protocol collects information about the current state of links and nodes in the network to build a network database. The PNNI network database can be used to determine the network structure and the current state of network components. To build the PNNI network database, each PNNI node must receive topology information from all the other devices in the network. To keep the database current, the node must receive regular updates from other nodes.

 

QUESTION 164

Select the 3 best answers describing operation and configuration of Frame-Relay Inverse ARP.

 

A.

Dynamic address mapping uses Frame Relay Inverse ARP to request the next-hop protocol address for a specific connection on its known DLCI.

B.

Responses to Inverse ARP requests are entered in an address-to-DLCI mapping table on the router or access server which is used to supply the next-hop protoco address or the DLCI for outgoing traffic.

C.

Inverse ARP is enabled by default for all protocols enabled on the physical interface.

D.

Inverse ARP is configured using the following command under the Interface configuration ‘frame-relay mapdlci (dlci number) protocol protocol-address’.

E.

Inverse ARP in Frame-Relay is synonymous of ARP in Ethernet.

 

Correct Answer: ABC

 

 

QUESTION 165

Select the three valid LMI extension:

 

A.

Multicasting

B.

Global addressing

C.

Forward-explicit congestion notification (FECN)

D.

Virtual circuit status messages.

E.

Backward-explicit congestion notification (BECN)

 

Correct Answer: ABD

Explanation:

Optional LMI Extensions:

The LMI specification also defines several optional extensions:

* Global addressing convention

* Multicast capability

* A simple flow control mechanism

* Ability for the network to communicate a PVC’s CIR to the subscriber in a Status message

* A new message type that allows the network to announce PVC status changes without prompting from the subscriber

Implementors may build any, all, or none of these features into their networks.

 

 

QUESTION 166

Pick the 4 valid ATM Cell Header fields:

 

A.

GFC-4 bits of generic flow control

B.

Forward-explicit congestion notification(FECN)

C.

VCI-16 bits of virtual channel identifier

D.

CLP-1 bit of congestion loss

E.

HEC-8 bit of header error control

F.

ATM Discard Eligibility(DE) bit

 

Correct Answer: ACDE

Explanation:

The ATM cell header consists of the following fields: generic flow control (GFC), virtual path identifier (VPI), virtual channel identifier (VCI), payload type (PT), cell loss priority (CLP) and header error control (HEC).

QUESTION 167

Which two of the following are designated fields for MAC tunneling protocol (802.1ah)?

 

A.

Control Word

B.

Tunnel Label

C.

802.1q VLAN TAG

D.

ISL

E.

Service Ethertype

F.

PseudoLAN TAG

 

Correct Answer: EF

 

 

QUESTION 168

Which type of AAL does ATM utilize to deliver CBR traffic?

 

A.

AAL2

B.

AAL4

C.

AAL5

D.

AAL1

E.

AAL3

 

Correct Answer: D

Explanation:

An ATM Adaptation layer 1 or AAL1 is used for transmitting Class A traffic, that is, real-time, constant bit rate, connection oriented traffic (example – uncompressed audio and video). Bits are fed in by the application at constant rate and must be delivered to other end with minimum delay, jitter or overhead. The input is stream of bits without message boundaries. For this traffic, error detection protocols cannot be used since timeouts and retransmission causes delay but the missing cells are reported to the application, that must take its own action to recover from them.

 

 

QUESTION 169

For SONET ring switching, the 50ms switch time? (Choose two.)

 

A.

lncludes the detection time

B.

Applies to rings smaller than 1200km

C.

Applies to rings smaller than 1000km

D.

Includes up to 16 nodes

 

Correct Answer: BD

Explanation:

APS protection switching has always been known for its recovery speed. SONET defines a maximum switch time of 50 milliseconds for a BLSR ring with no extra traffic and less than 1200 km of fiber. The specifications actually state 60 milliseconds, with 10 ms for discovery of the problem and 50 ms to perform the switch, but most people refer to this as just 50 ms.

The maximum number of nodes on a BLSR is 16.

 

 

QUESTION 170

What is the default maximum transmission unit on the Cisco router ATM interface?

 

A.

4470 bytes

B.

1516 bytes

C.

9288 bytes

D.

1500 bytes

E.

1492 bytes

 

Correct Answer: A

Explanation:

Why are MTUs 4470 Bytes?

Most Cisco ATM router interfaces use a default MTU size of 4470 bytes. This number was chosen to match exactly Fiber Distributed Data Interface (FDDI) and High-Speed Serial Interface (HSSI) interfaces for autonomous switching.

 

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