2013 Latest Cisco Designing for Cisco Internetwork Solutions Exam DESGN

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2013 Latest Cisco Designing for Cisco Internetwork Solutions Exam DESGN v2.1 640-864 EXAM download 136-140

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A wireless LAN or WLAN is a wireless local area network, which is the linking of two or more computers or devices without using wires. How are wireless LANs identified?
A. Service Set Identifier (SSID)
B. Internet Group Management Protocol (IGMP)
C. IP network
D. Wired Equivalent Privacy (WEP) key
Correct Answer: A
Section: Wireless Explanation
Service Set Identifier
WLANs use a service set identifier (SSID) to identify the WLANs network name. The SSID can be 2 to 32 characters long. All devices in the WLAN must have the same configured SSID to communicate. It is similar to a VLAN identifier in a wired network. The difficulty in large networks is configuring the SSID, frequency, and power settings for hundreds of remotely located access points. Cisco addresses this problem with the Cisco Wireless Control System (WCS). WCS is covered in more detail in the Cisco UWN Architecture section.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 5

QUESTION 137
Observe the following options, what is the hierarchy for IPv6 aggregatable addresses?
A. Global, site, loop
B. Multicast, anycast, unicast
C. Public, site, interface
D. Internet, site, interface
Correct Answer: C
Section: IP addressing Explanation
Global Unicast Addresses
IPv6 global addresses connect to the public network. These unicast addresses are globally unique and routable. This address format is initially defined in RFC 2374. RFC 3587 provides updates to the format. The original specification defined the address format with a three-layer hierarchy: public topology, site topology, and interface identifier.
The public topology consisted of service providers that provided transit services and exchanges of routing information. It used a top-level aggregator (TLA) identifier and a next-level identifier. A site-level aggregator (SLA) was used for site topology.
The site topology is local to the company or site and does not provide transit services. The TLA, NLA, and SLA identifiers are deprecated by RFC 3587. RFC 3587 simplifies these identifiers with a global routing prefix and subnet identifier for the network portion of the address.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 9

QUESTION 138
Which IGP protocol is a common choice as EIGRP and OSPF as a routing protocol for large networks?
A. RIPv2
B. IS-IS
C. IGRP
D. OSPFv2
Correct Answer: B
Section: Routing Explanation

Interior Versus Exterior Routing Protocols

Routing protocols can be categorized as interior gateway protocols (IGP) or exterior gateway protocols (EGP). IGPs are meant for routing within an organizations administrative domain (in other words, the organizations internal network). EGPs are routing protocols used to communicate with exterior domains, where routing information is exchanged between administrative domains. Figure 10-2 shows where an internetwork uses IGPs and EGPs with multiple autonomous administrative domains. BGP exchanges routing information between the internal network and an ISP. IGPs appear in the internal private network.
One of the first EGPs was called exactly that: Exterior Gateway Protocol. Today, BGP is the de-facto (and the only available) EGP. Potential IGPs for an IPv4 network are. Potential IGPs for an IPv6 network are. RIPv1 is no longer recommended because of its limitations. RIPv2 addresses many of the limitations of RIPv1 and is the most recent version of RIP. IGRP is an earlier version of EIGRP. RIPv1 and IGRP are no longer CCDA exam topics.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 10

QUESTION 139
Which type of routing protocol will be used when connecting to an Internet service provider?
A. Classless routing protocol
B. Exterior gateway protocol
C. Interior gateway protocol
D. Classful routing protocol
Correct Answer: B
Section: Routing Explanation
Routing protocols can be categorized as interior gateway protocols (IGP) or exterior gateway protocols (EGP). IGPs are meant for routing within an organizations administrative domain (in other words, the organizations internal network). EGPs are routing protocols used to communicate with exterior domains, where routing information is exchanged between administrative domains. When connecting to an ISP you are exchanging routing information between administrative domains so an EGP is required

QUESTION 140
Which routing protocol is classful?
A. Intermediate System-to-Intermediate System (IS-IS) and OSPF
B. Routing Information Protocol Version 1 (RIPv1) and RIPv2
C. IGRP and RIPv1
D. Enhanced Interior Gateway Routing Protocol (EIGRP) and Open Shortest Path First (OSPF)
Correct Answer: C
Section: Routing Explanation

Classless Versus Classful Routing Protocols

Routing protocols can be classified based on their support of VLSM and CIDR. Classful routing protocols do not advertise subnet masks in their routing updates; therefore, the configured subnet mask for the IP network must be the same throughout the entire internetwork. Furthermore, the subnets must, for all practical purposes, be contiguous within the larger internetwork. For example, if you use a classful routing protocol for network 130.170.0.0, you must use the chosen mask (such as 255.255.255.0) on all router interfaces using the 130.170.0.0 network. You must configure serial links with only two hosts and LANs with tens or hundreds of devices with the same mask of 255.255.255.0. The big disadvantage of classful routing protocols is that the network designer cannot take advantage of address summarization across networks (CIDR) or allocation of smaller or larger subnets within an IP network (VLSM). For example, with a classful routing protocol that uses a default mask of /25 for the entire network, you cannot assign a /30 subnet to a serial point-to-point circuit.
Classful routing protocols are Classless routing protocols advertise the subnet mask with each route. You can configure subnetworks of a given IP network number with different subnet masks (VLSM). You can configure large LANs with a smaller subnet mask and configure serial links with a larger subnet mask, thereby conserving IP address space. Classless routing protocols also allow flexible route summarization and supernetting (CIDR). You create supernets by aggregating classful IP networks. For example, 200.100.100.0/23 is a supernet of 200.100.100.0/24 and 200.100.101.0/24.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 10

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