Cisco 400-201 Exam PDF Study Guide

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Question No. 1

Which statement about ATM AAL5 over MPLS is true?

Answer: E

Restrictions

The following restriction apply to AAL5 over MPLS:

*The AAL5 over MPLS feature supports only AAL5 SDU switching.

*The following services are not supported with the AAL5 over MPLS feature:

–ATM switched virtual circuits (SVCs)

–ATM signaling

–Fragmentation and reassembly

–Traffic shaping of packets in the MPLS-to-ATM path

*The instructions for configuring AAL5 over MPLS in this feature module apply only to the Cisco 12000 series router for 12.0(21)ST. Avoid using these instructions for any other platform or release.

Question No. 2

Which two things are correct about QinQ technology? (Choose two.)

Answer: B, C

IEEE 802.1ad[note 1] is an Ethernet networking standard informally known as IEEE 802.1QinQ[by whom?] and is an amendment to IEEE standard IEEE 802.1Q-1998. The technique is also known as provider bridging, Stacked VLANs, or simply QinQ or Q-in-Q. “Q-in-Q” can for supported devices apply to C-tag stacking on Ctag (Ethernet Type = 0x8100) but this has limited application in the modern methodology of network routing.

The original 802.1Q specification allows a single Virtual Local Area Network (VLAN) header to be inserted into an Ethernet frame. QinQ allows multiple VLAN headers to be inserted into a single frame, an essential capability for implementing Metro Ethernet network topologies. Just as QinQ extends 802.1Q, QinQ itself is extended by other Metro Ethernet protocols.[specify]

In a multiple VLAN header context, out of convenience the term “VLAN tag” or just “tag” for short is often used in place of “802.1Q VLAN header”. QinQ allows multiple VLAN tags in an Ethernet frame; together these tags constitute a tag stack. When used in the context of an Ethernet frame, a QinQ frame is a frame that has 2 VLAN 802.1Q headers (double-tagged).

There is a mild confusion regarding the naming because the 802.1ad standard was grown out of the 802.1QinQ[citation needed] protocol (which was developed based the trademarked method 802.1Q, with capital “Q” as a distinction instead of the 802.1q as the standardised protocol) which originally used 0x8100 as ethernet type instead of 0x88a8. While the network industry usually mix the naming, the proper, standardized name is 802.1ad which sometimes gets appended by the other alternative names mentioned above; the plain “802.1QinQ”[citation needed] name usually refers to the old standard which is now[when?] considered obsolete.

Question No. 3

Which of the following comparison of Control Plane Policing (CoPP) with Receive ACL (Racl) is correct?

Answer: C, E

Question No. 4

Refer to the exhibit.

An ISP engineer has been asked to identity a method to protect the PE and to control the number of BGP prefixes learned from his customers. The BGP session should be dropped if the PE router receives more than 1000 BGP prefixes. A syslog message should be generated when the number of BGP prefixes learned from CE exceeds 850.

Which Cisco IOS command should the engineer apply on PE routers?

Answer: A

Question No. 5

Which statement about VPNv6 addresses is true?

Answer: B

Question No. 6

Having the above BGP peerings, select the two configurations for rtrB that will fulfill the following criteria:

-Will advertise all routes from rtrA to rtrD but not to rtrC

-Will advertise the routes from rtrD to rtrC

Answer: B, D

Question No. 7

When gateways are registering with a gatekeeper, the gatekeeper can be

Answer: D

Question No. 8

A company is given a 20 Mbps bandwidth guarantee provided over a FastEthernet connection by an ISP. Which QoS technology should be used to ensure that traffic conforms to the 20 Mbps contract?

Answer: A

Question No. 9

Which two statements about MPLS Label Distribution Protocol (LDP) are true? (Choose two)

Answer: B, F

Question No. 10

In which modes does selective packet discard (SPD) operate? (Choose three.)

Answer: B, C, D

Question No. 11

What is the payload capacity of an SDH/STM1 circuit?

Answer: B

Question No. 12

Which statement about L2VPN Pseudowire Switching is not true?

Answer: E

Question No. 13

Which two steps take place in the BGP Link State architecture ? (Choose two)

Answer: B, C

Question No. 14

Which description is true of what the fast-reroute keep-all-paths command accomplishes when under OSPF process?

Answer: C

Question No. 15

An engineer is configuring a Cisco CRS-1 Multishelf System. Which option describes the minimum LCC and FCC requirements for proper functionality?

Answer: B

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