2013 Latest Cisco DESGN (640-864) Exam 146-150

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Which is the remote monitoring agent in the RMON architecture called?

A. Tree
B. Station
C. Agent
D. Probe
Correct Answer: D
Section: Management – Operations Explanation
RMON
RMON is a standard monitoring specification that enables network monitoring devices and console systems to exchange network monitoring data. RMON provides more information than SNMP, but more sophisticated data collection devices (network probes) are needed. RMON looks at MAC layer data and provides aggregate information on the statistics and LAN traffic. Enterprise networks deploy network probes on several network segments; these probes report back to the RMON console. RMON allows network statistics to be collected even if a failure occurs between the probe and the RMON console. RMON1 is defined by RFCs 1757 and 2819, and additions for RMON2 are defined by RFC 2021. The RMON MIB is located at iso.org.dod.internet.mgt.mib.rmon or by the equivalent object descriptor,
1.3.6.1.2.1.16. RMON1 defines nine monitoring groups; each group provides specific sets of data. One more group is defined for Token Ring. Each group is optional, so vendors do not need to support all the groups in the MIB.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 15

QUESTION 147
Which type of DSL does residential service use?
A. VDSL
B. SDSL
C. IDSL
D. ADSL
Correct Answer: D
Section: WAN VPN Explanation
Digital Subscriber Line
Digital subscriber line (DSL) is a technology that provides high-speed Internet data services over ordinary copper telephone lines. It achieves this by using frequencies that are not used in normal voice telephone calls. The term xDSL describes the various competing forms of DSL available today. ADSL is the most popular DSL technology and is widely available. The key to ADSL is that the downstream bandwidth is asymmetric or higher than the upstream bandwidth. Some limitations include that ADSL can be used only in close proximity to the local DSLAM, typically less than 2 km. The local DSLAM, or digital subscriber line access multiplexer, allows telephone lines to make DSL connections to the Internet. Download speeds usually range from 768 kbps to 9 Mbps, and upload speeds range from 64 kbps to 1.5 Mbps. The customer premises equipment (CPE) refers to a PC along with DSL modem or DSL router that connects back to the network access provider (NAP) DSLAMs.
The ADSL circuit consists of a twisted-pair telephone line that contains their information channels.
DSL splitters are used to separate basic telephone service from the ADSL modem/router to provide service even if the ADSL signaling fails. Although DSL is primarily used in the residential community, this technology can also be used as a WAN technology for an organization. However, keep in mind that because this is a public network connection over the Internet, it is recommended that this technology be used in conjunction with a firewall/VPN solution back into your corporate enterprise network. The high speeds and relatively low cost make this a popular Internet access WAN technology.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 6

QUESTION 148
Which item is not a part of the process recommended by Cisco for WAN designs?
A. Characterize the existing network.
B. Analyze customer requirements.
C. Configure deployed services.
D. Design the new WAN topology.
Correct Answer: C
Section: Design Explanation

QUESTION 149
In IS-IS networks, which routers does the backup designated router (BDR) form adjacencies to?
A. Only to the DR.
B. The BDR only becomes adjacent when the DR is down.
C. To all routers.
D. There is no BDR in IS-IS.
Correct Answer: D
Section: Routing Explanation
BDRs are used by OSFP and NOT IS-IS. IS-IS uses L1 and L2 routers
A backup designated router (BDR) is a router that becomes the designated router if the current designated router has a problem or fails. The BDR is the OSPF router with second highest priority at the time of the last election.

QUESTION 150
What does Compressed Real-Time Transport Protocol (CRTP) compress ?
A. RTP, TCP, and IP headers
B. RTP headers
C. RTP, User Datagram Protocol (UDP), and IP headers
D. Real-Time Transport Control Protocol (RTCP) headers
Correct Answer: C
Section: Voice Video Explanation
WAN links use RTP header compression to reduce the size of voice packets. This is also called Compressed RTP (cRTP), which is defined in RFC 2508. As shown in Figure 14-18, cRTP reduces the IP/ UDP/RTP header from 40 bytes to 2 or 4 bytes (a significant decrease in overhead). cRTP happens on a hop-by-hop basis, with compression and decompression occurring on every link. It must be configured on both ends of the link. It is recommended for slow links up to 768 kbps. cRTP is not used much anyone because slow WAN link bandwidths are seen less. Higher speed links are not recommended because of the high CPU requirements and they reduce call quality.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 14 (Page 543)

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