2013 Latest Cisco Designing for Cisco Internetwork Solutions Exam DESGN v2.1 640-864 EXAM download 196-200
Study the following options carefully. The corporate Internet is part of which functional area?
A. Enterprise Edge
B. Enterprise Campus
C. Service Provider (SP) Edge
Correct Answer: A
Section: Design Explanation
The enterprise edge of the enterprise WAN includes access to WANs. WAN technologies include the following:
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 2
Which H.323 protocol is in charge of call setup and signaling?
Correct Answer: D
Section: Voice Video Explanation
H.323 terminals must support the following standards:
H.245 specifies messages for opening and closing channels for media streams and other commands,
requests, and indications. It is a control channel protocol.
Q.931 is a standard for call signaling used by H.323 within the context of H.225. It is also used by PRI links.
H.225 performs registration, admission, and status (RAS) signaling for H.323 sessions.
RTP is the transport layer protocol used to transport VoIP packets. RTCP is also a transport layer protocol.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 14
How often does a RIPv1 router broadcast its routing table by default?
A. Every 90 seconds.
B. Every 30 seconds.
C. Every 60 seconds.
D. RIPv1 does not broadcast periodically.
Correct Answer: B
Section: Routing Explanation
Distance-Vector Routing Protocols
The first IGP routing protocols introduced were distance-vector routing protocols. They used the Bellman-Ford algorithm to build the routing tables. With distance-vector routing protocols, routes are advertised as vectors of distance and direction. The distance metric is usually router hop count. The direction is the next-hop router (IP address) toward which to forward the packet. For RIP, the maximum number of hops is 15, which can be a serious limitation, especially in large nonhierarchical internetworks. Distance-vector algorithms call for each router to send its entire routing table to only its immediate neighbors. The table is sent periodically (30 seconds for RIP). In the period between advertisements, each router builds a new table to send to its neighbors at the end of the period. Because each router relies on its neighbors for route information, it is commonly said that distance-vector protocols route by rumor. Having to wait half a minute for a new routing table with new routes is too long for todays networks. This is why distance-vector routing protocols have slow convergence. RIPv2 and RIPng can send triggered updatesfull routing table updates sent before the update timer has expired. A router can receive a routing table with 500 routes with only one route change, which creates serious overhead on the network (another drawback). Furthermore, RFC 2091 updates RIP with triggered extensions to allow triggered updates with only route changes. Cisco routers support this on fixed point-to-point interfaces.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 10
For the following protocols, which one maps names to IPv6 addresses?
A. Domain Name System (DNS)
C. Address Resolution Protocol (ARP)
D. Neighbor discovery (ND)
Correct Answer: A
Section: IP addressing Explanation
DNS maps domain names to IP addresses, and ARP resolves IP addresses to MAC addresses. These protocols are important in TCP/IP networks because they simplify the methods of address assignment and resolution.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 8
What does CDP stand for ?
A. Collection Device Protocol
B. Campus Discovery Protocol
C. Cisco Device Protocol
D. Cisco Discovery Protocol
Correct Answer: D
Section: Management – Operations Explanation
Cisco Discovery Protocol (CDP) is a Cisco-proprietary protocol that can be used to discover only Cisco network devices. CDP is media and protocol independent, so it works over Ethernet, Frame Relay, ATM, and other media. The requirement is that the media support Subnetwork Access Protocol (SNAP) encapsulation. CDP runs at the data link layer of the OSI model. CDP uses hello messages; packets are exchanged between neighbors, but CDP information is not forwarded. In addition to routers and switches, IP phones and Cisco Unified Communication Manager (CUCM) servers also advertise CDP information. Being protocol and media independent is CDPs biggest advantage over other network management technologies. CDP provides key information about neighbors, including platforms, capabilities, and IP addresses, which is significant for network discovery. It is useful when SNMP community strings are unknown when performing a network discovery. When displaying CDP neighbors, you can obtain the following information:
Network management devices can obtain CDP information for data gathering. CDP should be disabled on untrusted interfaces, such as those that face the Internet, third-party networks, or other secure networks. CDP works only on Cisco devices.
Note. Disable CDP on interfaces for which you do not want devices to be discovered, such as Internet connections.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 15
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