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Slide 1: 640-863 Designing for Cisco Internetwork Solutions Exam: 640-863 Demo Edition CERT MAGIC 1 http://www.certmagic.com
Slide 2: 640-863 QUESTION: 1 Which statement accurately describes one difference between a small office and medium office topology? A. Small offices commonly use Rapid PVST+ for Layer 3 deployments. B. Medium offices use integrated 10/100/1000 interfaces as Layer 2 trunks. C. Medium offices use external access switches to support LAN connectivity. D. Medium offices commonly use integrated route and switching platforms. Answer: C QUESTION: 2 Certmagic.com is planning to upgrade its current network. The chief technology officer has supplied a topology diagram and an IP addressing scheme of the current network during an interview.Certmagic.com has been growing at about twenty percent per year. It has been difficult to maintain customer support at a satisfactory level. Therefore, the RST board has met with and directed the chief technology officer to look into network improvements.Which two items are most relevant in documenting Certmagic.com's business requirements? (Choose two.) A. network performance requirements B. existing network topologies C. the IP addresses assigned by the ISP D. improved customer support requirements E. projected growth estimates Answer: D,E QUESTION: 3 Which of these accurately describes dial backup routing? A. once the backup link is activated it will remain active even after the primary link is restored B. it always uses permanent static routes C. it is supplied by the service provider as a secondary PVC at no additional charge D. the router intiates the dial backup link when a failure is detected on the primary link E. it always uses distance vector routing protocols 2 http://www.certmagic.com
Slide 3: 640-863 Answer: D Explanation: Dial backup routing is a way of using a dialup service for backup purposes. The switched circuit provides the backup service for another type of circuit, such as point-to-point or Frame Relay. The router initiates the dial backup line when it detects a failure on the primary circuit. The dial backup line provides WAN connectivity until the primary circuit is restored, at which time the dial backup connection terminates QUESTION: 4 DRAG DROP You work as a network technician at Certmagic.com. Your boss, miss Certmagic, is interested in QoS features. Match the proper features with appropriate mechanism. Answer: 3 http://www.certmagic.com
Slide 4: 640-863 Explanation: 1. LLQ is a congestion management tool, which brings strict PQ (Priority Queuing) to CBWFQ (Class-Based Weighted Fair Queuing). It is a combination of PQ and CBWFQ. Strict PQ allows delay sensitive data such as voice to be dequeued and sent first (before packets in other queues are dequeued), giving delay-sensitive data preferential treatment over other traffic. 2. Congestion-avoidance techniques monitor network traffic loads so that congestion can be anticipated and avoided before it becomes problematic. WRED (Weighted random early detection) is the Cisco implementation of the random early detection (RED) mechanism. RED randomly drops packets when the queue gets to a specified level. 3. ACL (Access Control Lists) is used to control (Permit or Deny) the traffic moving through the network. In QoS implementation, ACL helps to classify the traffic. 4. Link Efficiency techniques like LFI and compression can be applied to WAN paths. The purpose of LFI is to prevents small voice packets from being queued behind large data packets, which could lead to unacceptable delays on low-sped links. 5. CAC (Call Admission Control) is a traffic conditioners mechanisms, which extend the QoS capabilities to protect voice traffic from being negatively affected by other voice traffic by keeping excess voice traffic off the network QUESTION: 5 Western Associated News Agency recently acquired a large news organization with several sites, which will allow it to expand to worldwide markets. The new acquisition includes these connectivity technologies: Frame Relay ATM SONET cable DSL wireless From a Layer 1 viewpoint, which Enterprise Edge module will be most affected? 4 http://www.certmagic.com
Slide 5: 640-863 A. E-Commerce B. Edge Distribution C. PSTN D. WAN/MAN E. Internet Connectivity F. ISP Answer: D Explanation: Wide Area Network(WAN)/MAN(Metropolitan Area Network) technologies are used to connect the different branches located into different locations. Frame-Relay, ISDN, DSL, Cable, Wireless are the technologies use for WAN/MAN. QUESTION: 6 Which H.323 protocol controls call setup between endpoints? A. RAS B. RTCP C. H.245 D. H.225 Answer: D Explanation: The H.225 is called Q.931 standard protocol. It describes call signaling and the Registration, Admission, and Status (RAS) signaling used for H.323 session establishment and packetization between two H.323 devices. QUESTION: 7 DRAG DROP You work as a network technician at Certmagic.com. Your boss, miss Certmagic, is interested in bandwidth usage optimization techniques. Match the proper technique with appropriate defintion 5 http://www.certmagic.com
Slide 6: 640-863 Answer: Explanation: Queuing: Queuing is called Congestion Management in Cisco documents and also occasionally called "scheduling" provides the ability to reorder packets when congestion occurs. Traffic Policing Policing can limit bandwidth by discarding traffic that exceeds a specified rate. Policing can discard the packets based on IP Precedence and DSCP value. Class-based traffic policing can be configured to mark packets at layer 2 or layer 3. Policing can apply to 6 http://www.certmagic.com
Slide 7: 640-863 either inbound or outbound traffic. Compression reduces bandwidth utilization by making packets smaller before transmission. Two general types of compression tools exist in payload compression and header compression. Payload compression compresses the packet the portion of the data link frame between the frame header and trailer. Header compression compresses just particular headers QUESTION: 8 Which two routing protocols operate over NBMA point-to-multipoint networks without the use of point-to-point subinterfaces? (Choose two.) A. OSPF B. IS-IS C. RIPv1 D. EIGRP E. IGRP F. RIPv2 Answer: A,D Explanation: Non-broadcast Multi-access NBMA topologies are similar to broadcast multi-access topologies (multiple devices accessing a medium), except that devices cannot hear each other's broadcasts because the medium is separated by other routers, such as with Frame Relay, ATM. OSPF and EIGRP routing protocols operate over NBMA point-tomultipoint networks without the use of point-to-point subinterface. QUESTION: 9 Which two capabilities of NetFlow accounting assist designers with network planning?(Choose two.) A. the monitoring of processor time on network devices B. the calculation of packet and byte counts of network traffic C. the monitoring of user network utilization D. the decoding and analyzing of packets E. the presentation of a time-based view of application usage on the network Answer: B,C 7 http://www.certmagic.com
Slide 8: 640-863 Explanation: NetFlow can provide assistance with traffic engineering, network planning, accounting and billing, security monitoring, and information regarding peering arrangements. Enterprises typically use NetFlow for user and Internet access monitoring, application monitoring, charge-back billing for departments, and security monitoring. QUESTION: 10 DRAG DROP You work as a network technician at Certmagic.com. Your boss, miss Certmagic, is interested in Cisco Security solutions. Match the proper solution with appropriate function. Answer: 8 http://www.certmagic.com
Slide 9: 640-863 Explanation: IPS: Network-based IPS solutions protect the network by helping detect, classify, and stop threats, including worms, spyware or adware, network viruses, and application abuse on Network. ASA Cisco ASAs consolidate all the foundation security technologies (including high performance firewall, IPS, network antivirus, and IPsec and SSL VPNs) in a single easily managed unified platform. Device consolidation reduces the overall deploymenand operations costs and complexity. ASAs can also be NAC-enabled.The Cisco Security Agent software integrates endpoint server and desktop computers into the Cisco SelfDefending Network. The Cisco Security Agent provides different services like: Spyware and adware protection, Protection against buffer overflows, Distributed firewall capabilities, Malicious mobile code protection. QUESTION: 11 Which two design criteria require VLANs in a proposed solution? (Choose two.) A. video streaming on the LAN B. a limited corporate budget C. security between departments D. the segmenting of broadcast domains E. the segmenting of collision domains F. the use of multivendor equipment 9 http://www.certmagic.com
Slide 10: 640-863 Answer: C,D Explanation: VLAN create a separate broadcast domain. So One vlan equal one broadcast domain. The logical concept of creating VLAN is to provide security. By default one VLAN member can't access another VLAN member. So one department can't access another department by default. QUESTION: 12 You design a network with the following network addresses: 192.168.168.0 192.168.169.0 192.168.170.0 192.168.171.0 192.168.172.0 192.168.173.0 192.168.173.0 192.168.174.0 192.168.175.0 Which route address is the best summary of these network addresses? A. 192.168.0.0/16 B. 192.168.168.0/21 C. 192.168.0.0/24 D. 192.168.171.128/3 E. 192.168.175.0/3 Answer: B Explanation: Route Summarization is called route aggregation. Route aggregation creates one route in the routing table represents many other routes. Summarizing routes reduces the routing update traffic and reduces the number of routes in the routing table and overall router overhead in the router receiving the routes Example of creating Summary Route: 192.168.168.0 = 11000000 10101000 10101 000 00000000 192.168.169.0 = 11000000 10101000 10101 001 00000000 192.168.170.0 = 11000000 10101000 10101 010 00000000 192.168.171.0 = 11000000 10101000 10101 011 00000000 10 http://www.certmagic.com
Slide 11: 640-863 192.168.172.0 =11000000 10101000 10101 100 00000000 192.168.173.0 = 11000000 10101000 10101 101 00000000 192.168.174.0 =11000000 10101000 10101 110 00000000 192.168.175.0 =11000000 10101000 10101 111 00000000 Number of Common Bits = 21 Number of Non-Common Network Bits = 3 Number of Host Bits = 8 So Answer 192.168.168.0/21 is correct. QUESTION: 13 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. verify open ports for: Layer 2 LWAPP on ethertype OxBABA Layer 3 LWAPP on UDP 12222 and TCP 12223 C. verify open ports for: Layer 2 LWAPP on ethertype OxABAB Layer 3 LWAPP on TCP 12222 and TCP 12223 D. use of Layer 2 LWAPP is preferred over Layer 3 LWAPP E. use of Layer 3 LWAPP is preferred over Layer 2 LWAPP Answer: A,E Explanation: LWAPP is an IETF draft protocol that defines the control messaging for setup and path authentication and runtime operations between APs and WLCs. LWAPP also defines the tunneling mechanism for data traffic. The LWAPP tunnel uses Layer 2 or Layer 3 transport.Layer 3 LWAPP transport mode is more flexible and scalable than Layer 2 LWAPP mode, most current products support Layer 3 LWAPP mode, and it is the recommended mode of LWAPP operation QUESTION: 14 Which statement can a network designer use to describe route summarization to an IT manager? 11 http://www.certmagic.com
Slide 12: 640-863 A. It is the grouping of ISP network addresses to minimize the number of routes to the Internet. B. It is the grouping of multiple contiguous subnets into one Class A, B, or C IP address to minimize routing table size. C. It is the grouping of multiple contiguous networks and advertising as one large network. D. It is the grouping of multiple discontiguous subnets to increase routing performance. Answer: C Explanation: Route Summarization is called route aggregation. Route aggregation creates one route in the routing table represents many other routes. Summarizing routes reduces the routing update traffic and reduces the number of routes in the routing table and overall router overhead in the router receiving the routes QUESTION: 15 Given a VoIP network with these attributes: Codec: G.728 Bit rate: 16 Kbps WAN Bandwidth: 256 Kbps Packet Header: 6 bytes Payload: 40 bytes CRTP: Yes How many calls can be made? A. 14 calls B. 13 calls C. 7 calls D. 8 calls Answer: B Explanation: When building voice networks, one of the most important factors to consider is bandwidth capacity planning. One of the most critical concepts to understand within 12 http://www.certmagic.com
Slide 13: 640-863 capacity planning is how much bandwidth is used for each VoIP call.Calculating Voice bandwidth requirements for G.728: 1. Voice packet size = (Layer 2 header) + (IP/UDP/RTP header) + (voice payload) 2. Voice packets per second (pps) = codec bit rate/voice payload size 3. Bandwidth per call = voice packet size * voice pps Payload Size is 50 bytes Bandwidth is 35 kbps Bandwidth with cRTP is 19 kbps Number of calls on 256 kbps link is 13 QUESTION: 16 Which two VoIP characteristics are affected most by codec choice? (Choose two.) A. silent packet handling B. bandwidth required for voice calls C. voice quality D. voice packet header size Answer: B,C Explanation: Bandwidth availability is a key issue to consider when designing voice on IP networks. The amount of bandwidth per call varies greatly, depending on which codec is used and how many voice samples are required per packet. However, the best coding mechanism does not necessarily result in the best voice quality. Each codec provides a certain quality of speech. The perceived quality of transmitted speech depends on a listener's subjective response. QUESTION: 17 Certmagic.com has the following Enterprise Campus design requirements: at least 10 Gbps of bandwidth network runs of up to 40km no concern for transmission medium cost Which transmission medium should you recommend to this customer? 13 http://www.certmagic.com
Slide 14: 640-863 A. multimode fiber B. wireless C. shielded twisted pair D. single-mode fiber E. unshielded twisted pair Answer: D Explanation: Single-mode fiber is optical fiber that carries a single wave of light. Lasers are typically used with single mode fiber. The typical diameter of an single mode fiber core is between 2 and 10 micrometers. Single-mode fiber limits dispersion and loss of light, and therefore allows for higher transmission speeds, but it is more expensive than multimode fiber. QUESTION: 18 After a period of rapid growth, FloCzar Boats is seeking better network management tools. Managers have developed this needs list: Move from static to dynamic device information. Gain information to assist in long-term trend analysis. Concentrate on Layer 4 monitoring. Which management protocol will most help FloCzar achieve its goals? A. SNMP B. NetFlow C. RMON D. RMON2 E. Cisco Discovery Protocol Answer: D Explanation: RMON1 only provides visibility into the data link and the physical layers; potential problems that occur at the higher layers still require other capture and decode tools. Because of RMON1's limitations, RMON2 was developed to extend functionality to upper-layer protocols.RMON2 allows the collection of statistics beyond a specific segment's MAC layer and provides an end-to-end view of network conversations per 14 http://www.certmagic.com
Slide 15: 640-863 protocol. The network manager can view conversations at the network and application layers QUESTION: 19 A Cisco SONA architecture layer is described as follows: The layer's IT resources are interconnected across a converged network foundation. The layer's IT resources include servers, storage, and clients. The layer represents how resources exist across the network. The customer objective for the layer is to have anywhere/anytime connectivity. Which Cisco SONA architecture layer is being described? A. Interactive Services B. Physical C. Networked Infrastructure D. Application E. Integrated Transport Answer: C Explanation: The Cisco SONA is an architectural framework that illustrates how to build integrated systems and guides the evolution of enterprises toward more intelligent networks. SONA has three different layers: 1. Network Infrastructure Layer 2. Interactive Services Layer 3. Application Layer Network Infrastructure Layer: Network Infrastructure is the layer, where all the IT resources are interconnected across a converged network foundation. The IT resources include servers, storage, and clients.The Networked Infrastructure layer represents how these resources exist in different places in the network, including the campus, branch, data center, enterprise edge, WAN, metropolitan-area network (MAN), and with the teleworker. QUESTION: 20 Which two of these are scalability benefits of designing a network that utilizes VPNs?(Choose two.) A. extends the network to remote users 15 http://www.certmagic.com
Slide 16: 640-863 B. simplifies the underlying structure of Certmagic.com WAN C. reduces dial infrastructure expenditures D. reduces the number of physical connections E. allows networks to be set up and restructured quickly Answer: B,D Explanation: AVPN is connectivity deployed on a shared infrastructure with the same policies, security, and performance as a private network, but typically with lower total cost of ownership.There are different benefits of VPN: 1. Flexibility 2. Scalability 3. Lower network communication cost 16 http://www.certmagic.com