Pass4sure 640-864 Sample Question

QUESTION NO: 1

Which Cisco proprietary protocol will be used in LAN switches to control multicast traffic at the data link layer within a LAN switch?

A. MAC filters
B. Cisco Group Management Protocol (CGMP)
C. Cisco Discovery Protocol (CDP)
D. IGMP

Answer: B

Explanation:

CGMP
Cisco Group Management Protocol is a Cisco proprietary protocol implemented to control multicast traffic at Layer 2. Because a Layer 2 switch is unaware of Layer 3 IGMP messages, it cannot keep multicast packets from being sent to all ports.With CGMP, the LAN switch can speak with the IGMP router to find out the MAC addresses of the hosts that want to receive the multicast packets. You must also enable the router to speak CGMP with the LAN switches. With CGMP, switches distribute multicast sessions to the switch ports that have group members. Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 3 Topic 2, Main Questions

QUESTION NO: 2

Which two link state routing protocols support IPv6 routing? (Choose two)

A. BGP4+
B. OSPF
C. RIPng
D. EIGRP
E. IS-IS

Answer: B,E

Explanation: 

only OSPF & IS-IS are LSPs which support IPv6.

Link:
http://www.cisco.com/en/US/partner/products/ps10591/products_installation_and_configuration_guides_list.html
Topic 3, Exam Set A

QUESTION NO: 3

Your company uses OSPF for internal routing. The company will be connected to VendorA via a single dedicated link and to VendorB via redundant dedicated links. Both vendors also use OSPF for internal routing. Which of the following deployments describes the best intra-domain routing practice in this situation?

A. Redistribute the routes on each link between your company and the vendors to a shared EIGRP routing protocol.
B. Use IBGP to reach VendorA and EBGP to reach VendorB.
C. Use static routes to reach VendorA and EBGP to reach VendorB.
D. Use static routes to reach both VendorA and VendorB.
E. Connect your company to both VendorA and VendorB using existing OSPF.

Answer: C

QUESTION NO: 4

For the following options, which emerging WAN technology uses DSL coding and digital modulation techniques with Ethernet?

A. Cable
B. Wireless
C. SMDS
D. Long-Reach Ethernet (LRE)

Answer: D

Explanation:

Long Reach Ethernet (LRE) was a proprietary networking protocol developed by Cisco Systems, intended to support multi-megabit (5 to 15 Mbit/s) performance over telephone-grade Category
1/2/3 wiring over distances up to 5,000 feet (1.5 km). Supporting such great distances, LRE is
technically classified a Metropolitan area network (MAN) technology. Technically the protocol was
similar to VDSL.

The technology was sometimes referred to as Ethernet in the First Mile (EFM). Several networking
vendors offered compatible networking hardware, but the technology became obsolete.Like standard VDSL, LRE allowed existing telephone wiring that connects an organization's offices to be used to network those offices together using standard Ethernet protocol without incurring the huge cost of deploying fiber optic cable or limiting organizations to the bandwidth provided by modems or xDSL devices. Other sample applications included Ethernet access to hotel rooms or college dormitories over existing installed telephone wiring. LRE was compatible with VDSL ETSI Band Plan 998.LRE sold Cisco Catalyst model 2900 switches using Infineon PEF22822/PEB22811 VDSL QAM
(10Base-S) chipset like many other VDSL concentrators.Cisco announced end-of-sale for the LRE products in October 2006, and its explanation page was removed from their web site in 2007. VDSL is a comparable or better solution.

QUESTION NO: 5

Which two of these are functions of an access point in a Split MAC Network Architecture? (Choose
two.)

A. EAP Authentication
B. MAC layer encryption or decryption
C. 802.1Q encapsulation
D. Process probe response

Answer: B,D

Explanation:

Cisco Unified Wireless Network Split-MAC Architecture With the Cisco UWN split-MAC operation, the control and data messages are split. LWAPs communicate with the WLCs using control messages over the wired network. LWAPP or CAPWAP data messages are encapsulated and forwarded to and from wireless clients. The WLC manages multiple APs, providing configuration information and firmware updates as needed. LWAP MAC functions are Controller MAC functions are Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 5

QUESTION NO: 6

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)

Answer: C

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. Classless routing protocols are Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 10

QUESTION NO: 7

When collecting information about a customer's existing network, which two sources will provide
the most accurate data? (Choose two.)

A. traffic analysis
B. customer interview
C. customer-supplied server list
D. existing network topology diagram
E. configurations obtained from network equipment

Answer: A,E

QUESTION NO: 8

Which two of the following statements represent a preferred wireless LWAPP implementation (Choose two.)
A. verify open ports for:

• Layer 2 LWAPP on ethertype OxBBBB
• Layer 3 LWAPP on UDP 12222 and UDP 12223

B. use of Layer 3 LWAPP is preferred over Layer 2 LWAPP
C. use of Layer 2 LWAPP is preferred over Layer 3 LWAPP
D. verify open ports for:

• Layer 2 LWAPP on ethertype OxBABA
• Layer 3 LWAPP on UDP 12222 and TCP 12223

E. verify open ports for:

• Layer 2 LWAPP on ethertype OxABAB
• Layer 3 LWAPP on TCP 12222 and TCP 12223

Answer: A,B

Explanation:

LWAPP
Lightweight Access Point Protocol (LWAPP) is a draft Internet Engineering Task Force (IETF)
standard for control messaging for setup, authentication, and operations between APs and WLAN
controllers (WLC). In the LWAPP RFC draft, LWAPP control messages can be transported at Layer 2 tunnels or Layer 3 tunnels. Layer 2 LWAPP tunnels were the first method developed in which the APs did not require an IP address.

The disadvantage of Layer 2 LWAPP was that the WLC needed to be on every subnet on which the AP resides. Layer 2 LWAPP is a deprecated solution for Cisco. Layer 3 LWAPP is the preferred solution. In the configuration, Layer 2 or Layer 3 transport modes can be selected. When set Layer 3, the LWAPP uses IP addresses to communicate with the access points; these IP addresses are collected from a mandatory DHCP server. When set to Layer 2, the LWAPP uses proprietary code to communicate with the access points. Note Layer 2 LWAPP tunnels use EtherType code 0xBBBB. Layer 3 LWAPP uses UDP ports 12222 and 12223. Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 5 Topic 1, Volume B

QUESTION NO: 9

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.

Answer: B

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 today’s networks. This is why distance-vector routing protocols have slow convergence. RIPv2 and RIPng can send triggered updates—full 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.The following is a list of IP distance-vector routing protocols: Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 10