[Free] Download New Latest (June 2016) Cisco 400-201 Practice Test 171-180

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QUESTION 171

What are the default values for GRE tunnel keepalive time and number of retries?

 

A.

5 seconds and 3 retries

B.

10 seconds and 5 retries

C.

10 seconds and 3 retries

D.

20 seconds and 5 retries

E.

5 seconds and 5 retries

 

Correct Answer: C

Explanation:

This output shows the commands you use in order to configure keepalives on GRE tunnels.

Router# configure terminal

Router(config)#interface tunnel0

Router(config-if)#keepalive 5 4

!— The syntax of this command is keepalive [seconds [retries]].

!— Keepalives are sent every 5 seconds and 4 retries.

!— Keepalives must be missed before the tunnel is shut down.

!— The default values are 10 seconds for the interval and 3 retries.

 

 

QUESTION 172

GMPLS is based upon:

 

A.

VPI/VCI-based switching devices

B.

Non-Packet-based devices

C.

Packet-based switching devices

D.

None of the above

 

Correct Answer: B

Explanation:

The Generalized Multi-Protocol Label Switching (GMPLS)[1] is a protocol suite extending MPLS to manage further classes of interfaces and switching technologies other than packet interfaces and switching, such as time division multiplex, layer-2 switch, wavelength switch and fiber-switch.

 

GMPLS is composed of three main protocols:

Resource Reservation Protocol with Traffic Engineering extensions (RSVP-TE) signaling protocol.[5][6]

Open Shortest Path First with Traffic Engineering extensions (OSPF-TE) routing protocol.[7][8]

Link Management Protocol (LMP).[9]

 

QUESTION 173

What is the function of the AJB bits on DS1 using Extended Super Frame (ESF)?

 

A.

It is used for signaling on-hook and off-hook status.

B.

It carries CRC information for error detection.

C.

It is used for a control and performance information.

D.

It is used for a frame’s synchronization and alignment.

 

Correct Answer: A

Explanation:

DS1 frame synchronization[edit source | edit]

See also: Synchronization in telecommunications

Frame synchronization is necessary to identify the timeslots within each 24-channel frame. Synchronization takes place by allocating a framing, or 193rd, bit. This results in 8 kbit/s of framing data, for each DS1.

Because this 8-kbit/s channel is used by the transmitting equipment as overhead, only 1.536 Mbit/s is actually passed on to the user. Two types of framing schemes are Super Frame (SF) and Extended Super Frame (ESF). A Super Frame consists of twelve consecutive 193-bit frames, whereas an Extended Super Frame consists of twenty-four consecutive 193-bit frames of data. Due to the unique bit sequences exchanged, the framing schemes are not compatible with each other. These two types of framing (SF, and ESF) use their 8 kbit/s framing channel in different ways.

 

 

QUESTION 174

Which two statements about spanning tree path cost are true? (Choose two.)

 

A.

The path cost can be changed for an interface using the spanning-tree cost command.

B.

The path cost can be changed for an interface using the stp path-cost command.

C.

The STP default path cost depends on the interface speed.

D.

The STP default path cost is similar for all interface.

 

Correct Answer: AC

 

 

QUESTION 175

Two islands of IPv6 networks that are running ISIS (IPv6 IGP) must be connected using a tunnel over an IPv4 network. Which tunneling method can be used to achieve this goal?

 

A.

GRE tunnels

B.

automatic 6 to 4 tunnels

C.

ISATAP tunnels

D.

manual tunnels (RFC 2893)

 

Correct Answer: A

Explanation:

GRE has a protocol field that identifies the passenger protocol. GRE tunnels allow Intermediate System-to-Intermediate System (IS-IS) or IPv6 to be specified as a passenger protocol, which allows both IS-IS and IPv6 traffic to run over the same tunnel. If GRE did not have a protocol field, it would be impossible to distinguish whether the tunnel was carrying IS-IS or IPv6 packets. The GRE protocol field is why it is desirable that you tunnel IS-IS and IPv6 inside GRE.

Reference: http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-tunnel.html

 

 

QUESTION 176

Which three are the ATM cell header fields? (Choose three.)

 

A.

Cell loss priority (CLP)

B.

Discard eligibility (DE)

C.

Head error control (HEC)

D.

Generic flow control (GFC)

E.

Forward explicit congestion notification (FECN)

 

Correct Answer: ACD

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 177

Which two statements about 10 Gigabit Ethernet (10GE) are true? (Choose two.)

 

A.

10 Gigabit Ethernet does not support VLAN definition

B.

10 Gigabit Ethernet supports full duplex links, but does not support half duplex links.

C.

10 Gigabit Ethernet supports unshielded or shielded twisted-pair cable connections

D.

10 Gigabit Ethernet supports Carrier Sense Multiple Access with Collision Detection (CSMA/CD).

E.

10 Gigabit Ethernet supports optical fiber connections in single mode only. Multi mode is not supported.

 

Correct Answer: BC

 

 

QUESTION 178

An architecture that utilizes PPPoE deals with IP address allocation by what type of negotiation?

 

A.

NIS

B.

IPCP

C.

RADIUS

D.

LDAP

 

Correct Answer: B

 

 

QUESTION 179

Assume two routers on the same subnet, R1 and R2, both configured for HSRP. R1 has a priority of 120. Which of the following HSRP interface configurations will always result in the R2 becoming the primary? (Choose two.)

 

A.

standby 1 priority 120

B.

standby 1 priority 130 preempt

C.

standby 1 priority 130

D.

standby 1 priority 120 preempt

E.

standby 1 priority 110 preempt

F.

standby 1 priority 110

 

Correct Answer: BC

QUESTION 180

SONET’s three layers are. (Choose three.)

 

A.

DS1

B.

Frame

C.

Path

D.

Line

E.

Section

 

Correct Answer: CDE

Explanation:

SONET Layers

SONET divides the overhead and transport functions into three layers:

Section

Line

Path

These three layers are associated with both the physical equipment that segments the network and the bytes of information that flows through the network elements.

 

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