Download New Updated (July) Cisco 400-101 Actual Test 61-70

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QUESTION 61

Which two statements are true about an EPL? (Choose two.)

 

A.

It is a point-to-point Ethernet connection between a pair of NNIs.

B.

It allows for service multiplexing.

C.

It has a high degree of transparency.

D.

The EPL service is also referred to as E-line.

 

Correct Answer: CD

Explanation:

Ethernet private line (EPL) and Ethernet virtual private line (EVPL) are carrier Ethernet data services defined by the Metro Ethernet Forum. EPL provides a point-to-point Ethernet virtual connection (EVC) between a pair of dedicated user-network interfaces (UNIs), with a high degree of transparency. EVPL provides a point-to-point or point-to-multipoint connection between a pair of UNIs.

The services are categorized as an E-Line service type, with an expectation of low frame delay, frame delay variation and frame loss ratio. EPL is implemented using a point-to-point (EVC) with no Service Multiplexing at each UNI (physical interface), i.e., all service frames at the UNI are mapped to a single EVC (a.k.a. all-to-one bundling).

Reference: http://en.wikipedia.org/wiki/Ethernet_Private_Line

 

 

QUESTION 62

Which two statements describe characteristics of HDLC on Cisco routers? (Choose two.)

 

A.

It supports multiple Layer 3 protocols.

B.

It supports multiplexing.

C.

It supports only synchronous interfaces.

D.

It supports authentication.

 

Correct Answer: AC

Explanation:

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. Cisco HDLC also provides a simple control protocol called Serial Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. Cisco HDLC is the default for data encapsulation at Layer 2 (data link) of the Open System Interconnection (OSI) stack for efficient packet delineation and error control. The absence of a protocol type field in the HDLC header posed a problem for links that carried traffic from more than one Layer 3 protocol. Cisco, therefore, added an extra Type field to the HDLC header, creating a Cisco-specific version of HDLC. Cisco routers can support multiple network layer protocols on the same HDLC link. For example an HDLC link between two Cisco routers can forward both IPv4 and IPv6 packets because the Type field can identify which type of packet is carried inside each HDLC frame.

Reference
: http://www.cisco.com/c/en/us/td/docs/routers/access/800/819/software/configuration/Guide/819_SCG/6ser_conf.html#pgfId-1073734

 

 

QUESTION 63

Which mechanism can be used on Layer 2 switches so that only multicast packets with downstream receivers are sent on the multicast router-connected ports?

 

A.

IGMP snooping

B.

Router Guard

C.

PIM snooping

D.

multicast filtering

 

Correct Answer: C

Explanation:

Ideally, the Layer 2 device should forward the multicast transmission only out ports to which receivers are connected and also out any ports that are connected to downstream multicast routers. This configuration requires a Layer 2 device to be able to determine the ports on which multicast routers and receivers for each separate (S,G) or (*,G) multicast group are located. To facilitate intelligent forwarding of multicast traffic on the LAN, Cisco Catalyst switches support two mechanisms:

Reference: https://www.informit.com/library/content.aspx?b=CCNP_Studies_Switching&seqNum=59

 

 

QUESTION 64

Which technology can be used to prevent flooding of IPv6 multicast traffic on a switch?

 

A.

IGMP snooping

B.

IGMP filtering

C.

MLD snooping

D.

MLD filtering

 

Correct Answer: C

Explanation:

MLD snooping allows the switch to examine MLD packets and make forwarding decisions based on their content.

You can configure the switch to use MLD snooping in subnets that receive MLD queries from either MLD or the MLD snooping querier. MLD snooping constrains IPv6 multicast traffic at Layer 2 by configuring Layer 2 LAN ports dynamically to forward IPv6 multicast traffic only to those ports that want to receive it.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12- 2SX/configuration/guide/book/snoopmld.htm
l

QUESTION 65

Refer to the exhibit. Which VLANs are permitted to send frames out port FastEthernet0/1?

 

clip_image002

 

A.

100 – 200

B.

4 – 100

C.

1 and 4 – 100

D.

3 and 4 – 100

 

Correct Answer: D

Explanation:

Traffic on the native vlan does not get tagged as it crosses a trunk, so there is no dot1q tag in the first place to be filtered. And you don’t need to allow the native vlan. But if we force to tag the native vlan (with the “switchport trunk native vlan tag” command) then if the native vlan is not in the “allowed vlan” list it will be dropped.

 

 

QUESTION 66

Which option is the default maximum age of the MAC address table?

 

A.

300 seconds

B.

500 seconds

C.

1200 seconds

D.

3600 seconds

Correct Answer: A

Explanation:

To configure the maximum aging time for entries in the Layer 2 table, use the mac-address-table aging-time command in global configuration mode.

Syntax Description

seconds

MAC address table entry maximum age. Valid values are 0, and from 5 to 1000000 seconds. Aging time is counted from the last time that the switch detected the MAC address. The default value is 300 seconds.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/lanswitch/command/reference/lsw_book/lsw_m1.html

 

 

QUESTION 67

Refer to the exhibit. Which two statements about the output are true? (Choose two.)

 

clip_image003

 

A.

802.1D spanning tree is being used.

B.

Setting the priority of this switch to 0 for VLAN 1 would cause it to become the new root.

C.

The hello, max-age, and forward delay timers are not set to their default values.

D.

Spanning-tree PortFast is enabled on GigabitEthernet1/1.

 

Correct Answer: AB

Explanation:

802.1D is the standard for Spanning tree, which is being used here. For priority, The priority order starts from 0 (yes, 0
is valid) and then increases in 4096.

0, 4096, 8192, 12288, …. Etc.

The lower the number, the higher the priority. Here we see that the current root has a priority of 8192, so configuring this with a priority of 0 will make it the new root.

 

 

QUESTION 68

Which statement is true about Fast Link Pulses in Ethernet?

 

A.

They are used during collision detection.

B.

They are used only if the media type is optical.

C.

They are part of UniDirectional Link Detection.

D.

They are used during autonegotiation.

 

Correct Answer: D

Explanation:

To make sure that your connection is operating properly, IEEE 802.3 Ethernet employs normal link pulses (NLPs), which are used for verifying link integrity in a 10BaseT system. T
his signaling gives you the link indication when you attach to the hub and is performed between two directly connected link interfaces (hub-to-station or station-to-station). NLPs are helpful in determining that a link has been established between devices, but they are not a good indicator that your cabling is free of problems.

An extension of NLPs is fast link pulses. These do not perform link tests, but instead are employed in the autonegotiation process to advertise a device’s capabilities.

Reference: http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html

 

 

QUESTION 69

Which statement is true regarding UDLD and STP timers?

 

A.

The UDLD message timer should be two times the STP forward delay to prevent loops.

B.

UDLD and STP are unrelated features, and there is no relation between the timers.

C.

The timers need to be synced by using the spanning-tree udld-sync command.

D.

The timers should be set in such a way that UDLD is detected before the STP forward delay expires.

 

Correct Answer: D

Explanation:

UDLD is designed to be a helper for STP. Therefore, UDLD should be able to detect an unidirectional link before STP would unblock the port due to missed BPDUs. Thus, when you configure UDLD timers, make sure your values are set so that unidirectional link is detected before “STP MaxAge + 2xForwardDelay” expires.

Reference: http://blog.ine.com/tag/stp/

 

 

QUESTION 70

Which switching technology can be used to solve reliability problems in a switched network?

 

A.

fragment-free mode

B.

cut-through mode

C.

check mode

D.

store-and-forward mode

 

Correct Answer: D

Explanation:

Characteristics of Store-and-Forward Ethernet Switching

This section provides an overview of the functions and features of store-and-forward Ethernet switches.

Error Checking

Figure 1 shows a store-and-forward switch receiving an Ethernet frame in its entirety. At the end of that frame, the switch will compare the last field of the datagram against its own frame-check- sequence (FCS) calculations, to help ensure that the packet is free of physical and data-link errors. The switch then performs the forwarding process. Whereas a store-and-forward switch solves reliability issues by dropping invalid packets, cut- through devices forward them because they do not get a chance to evaluate the FCS before transmitting the packet.

Figure 1. Ethernet Frame Entering a Store-and-Forward Bridge or Switch (from Left to Right)

 

clip_image005

 

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5020-switch/white_paper_c11-465436.html

 

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