What is important for the top-down design concept?
A. Engagement of the HR representatives during the design process
B. Engagement of the top executives during the design process
C. Engagement of the employees working on the top floors in the building during the design process
D. Engagement of the top executives once the design process is finalized
Correct Answer: B
Section: Design Explanation
Which one of the following QoS mechanisms is recommended for VoIP networks?
A. Low-latency queuing (LLQ)
B. Switched-based queuing
C. Fast queuing
D. Custom queuing
Correct Answer: A
Section: QoS Explanation
Low-latency queuing (LLQ) adds a strict priority queue (PQ) to CBWFQ. The strict PQ allows delay sensitive traffic such as voice to be sent first, before other queues are serviced. That gives voice preferential treatment over the other traffic types. Unlike priority queuing, LLQ provides for a maximum threshold on the PQ to prevent lower priority traffic from being starved by the PQ. Without LLQ, CBWFQ would not have a priority queue for real-time traffic. The additional classification of other traffic classes is done using the same CBWFQ techniques. LLQ is the standard QoS method for many VoIP networks.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 6
In which layer of the OSI model does Real-Time Transport Protocol (RTP) operate ?
Correct Answer: C
Section: Voice Video Explanation
OSI MODEL, LAYERS & PROTOCOLS
Web Browser, Email, Print Serivces, SIP, SSH and SCP, NFS, RTSP, Feed, XMPP, Whois, SMB; DNS; FTP; TFTP; BOOTP; SNMP;RLOGIN; SMTP; MIME; NFS; FINGER; TELNET; NCP; APPC; AFP; SMB
XDR, ASN.1, SMB, AFP, NCP, MIDI, HTML, GIF, TIFF, JPEG, ASCII, EBCDIC
TLS, SSH, X.225, RPC, NetBIOS, ASP, Winsock, BSD
TCP, UDP, RTP, SCTP, SPX, ATP Gateway, Advanced Cable Tester, Brouter
IP, ICMP, IGMP, BGP, OSPF, RIP, IGRP, EIGRP, ARP, RARP, X.25, NETBEUI Brouter, Router, Frame Relay Device, ATM Switch, Advanced Cable Tester, DDP
2 Data Link
Ethernet, Token ring, StarLAN, HDLC, Frame relay, ISDN, ATM, 802.11 WiFi, FDDI, PPP, Bridge, Switch, ISDN Router, Intelligent Hub, NIC, Advanced Cable Tester, ARCNET, LocalTalk, FDDI, ATM. NIC Drivers: Open Datalink Interface (ODI), Network Independent Interface Specification (NDIS)
NIC, Twisted Pair, Coax, Fiber Optic, Wireless Media, Repeater, Multiplexer, Hubs, (Passive/Active), TDR, Oscilloscope, Amplifier, Carrier pigeon
4 Application (OSI – Layers5 through 7)
HTTP, FTP, DNS (Routing protocols like BGP and RIP, which for a variety of reasons run over TCP and UDP respectively, may also be considered part of the Internetwork layer)
3 Transport (OSI – Layers4 and 5)
TCP, UDP, RTP, SCTP (Routing protocols like OSPF, which run over IP, may also be considered part of the Internetwork layer)
2 Internetwork (OSI – Layer 3)
For TCP/IP this is the Internet Protocol (IP) (Required protocols like ICMP and IGMP run over IP, but may still be considered part of the Internetwork layer; ARP does not run over IP)
1 Link (OSI – Layers 1 and 2)
Ethernet, Wi-Fi, MPLS, etc.
Developing a network design according to layers such as core and distribution is an example of which type of design methodology?
A. Flat design
C. Hierarchical structured design
D. PDIOO Correct Answer: C
Section: Design Explanation
Hierarchical Network Design
As shown in the figure, a traditional hierarchical LAN design has three layers:
Hierarchical Network Design Has Three Layers: Core, Distribution, and Access
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 2 (Page 41)
Which parameters does the computation of the EIGRP composite metric use by default?
A. Bandwidth and reliability
B. Bandwidth and load
C. Bandwidth and maximum transmission unit (MTU)
D. Bandwidth and delay
Correct Answer: D
Section: Routing Explanation
The characteristics of EIGRP for IPv4 networks follow:
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 10
Ensurepass offers Latest 2013 640-864 Real Exam Questions, help you to pass exam 100%.