ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 75
Текст из файла (страница 75)
The IP address of the Fa0/0 interface is not usable.E. The S0/1 interface of the ISP router is in the wrong subnet.Answer: BExplanation:According to the configuration shown above, the NAT pool only specifies 5 IP addresses(192.0.2.161-165) while there are 16 hosts on the network that need to be translated. Thisexplains why everything functions well for the first hosts, but not for the rest. To fix thisissue, more IP addresses need to be specified in the NAT pool named SOS, oralternatively the "overload" keyword could be used to specify many to one addresstranslation, or PAT.Several internal addresses can be NATed to only one or a few external addresses byusing a feature called Port Address Translation (PAT) which is also referred to as"overload", a subset of NAT functionality.PAT uses unique source port numbers on the Inside Global IP address to distinguishbetween translations.
Because the port number is encoded in 16 bits, the total numbercould theoretically be as high as 65,536 per IP address. PAT will attempt to preserve theoriginal source port, if this source port is already allocated PAT will attempt to find theActualtests.com - The Power of Knowing640-802first available port number starting from the beginning ofthe appropriate port group0-5111, 512-1023 or 1024-65535. If there is still no port available from the appropriategroup and more than one IP address is configured, PAT will move to the next IP addressand try to allocate the original source port again.
This continues until it runs out ofavailable ports and IP addresses.Alternatively, we could have configured port address translation, or NAT overload, toprovide Internet access to the given number of hosts.QUESTION 663:The Certkiller network is shown in the diagram below:The network administrator has configured NAT as shown in the exhibit. Someclients can access the Internet while others cannot.What should the network administrator do to resolve this problem?A. Configure an IP NAT pool.B. Properly configure the ACL.C. Apply the ACL to the S0 interface.D.
Configure another interface with the ip nat outside command.E. Configure the ip nat inside and ip nat outside commandsActualtests.com - The Power of Knowing640-802Answer: BExplanation:"Some clients can access the Internet while others cannot." this is a huge hint that tell useither:1. ACL is blocking some people2. You are not using overload when you should3. That you are using 2 inside subnets like in this example & 1 of those does not have theIP NAT INSIDE statement against it.In this example, the access list specified is only allowing users on the 192.168.1.0/24subnet should be translated, so all of the users on E1 (192.168.2.X/24 subnet) will not gettranslated, and will therefore not be able to reach the Internet.QUESTION 664:Of the following choices below, only three could be used as WAN encapsulationmethods, as opposed to LAN encapsulation.
Which three are they? (Choose three)A. FDDIB. HDLCC. Frame RelayD. PPPE. Token RingF. EthernetG. VTPAnswer: B, C, DQUESTION 665:In the Certkiller network shown below, an associate has the task of planning aFrame Relay implementation to replace the existing WAN infrastructure.Actualtests.com - The Power of Knowing640-802The addresses for the North, East, and South branch offices have been assigned asshown in the diagram. Which type of topology should be implemented in thisnetwork?A. Extended starB.
RingC. Hub and spokeD. BusE. Full meshAnswer: CExplanation:In a Fully meshed environment, every router has a PVC defined to every other router andin a Non-fully meshed environment (or Hub and Spoke) PVCs are only defined betweenrouters that need to communicate. In this example, a /30 IP subnet mask is used at eachremote location. This mask allows for only two hosts on the network, which will used forthe local router's frame relay interface, and the hub router's interface.
In this example, allsite to site (spoke) traffic will need to traverse through the main (hub) location.QUESTION 666:What can the Certkiller network administrator utilize by using PPP (Point to PointProtocol) as the Layer 2 encapsulation? (Choose three)A. CompressionB. QOSC. Sliding windowsD. VLAN supportE. AuthenticationF. Multilink supportAnswer: A, E, FQUESTION 667:You need to establish a point to point circuit between a Cisco router and a Juniperrouter on the Certkiller network. You are having difficulty in establishing this seriallink between a Cisco router and another vendor.
Both routers are configured forHDLC encapsulation. Which statements are true regarding this configuration?(Choose two)A. HDLC requires a clock rate to be configured on the routers at both ends of the serialActualtests.com - The Power of Knowing640-802link.B. The Cisco HDLC frame uses a proprietary "Type" field that may not be compatiblewith equipment of other vendors.C. PPP encapsulation is recommended for serial links between equipment from multiplevendors.D. Usernames must be configured at both ends of the HDLC serial linkE. There is a mismatch in the HDLC authentication password configurations.F.
The HDLC vendor type must be enabled on the Cisco router.Answer: B, CExplanation:The High Level Data Link Control protocol (HDLC) is the default encapsulation used onthe synchronous serial interfaces of a Cisco router.HDLC is a Data Link layer protocol used to encapsulate and transmit packets overpoint-to-point links.
It handles the transfer of data in full duplex, as well as linkmanagement functions. As an OSI standard, many vendors implement the HDLCprotocol in their equipment. Unfortunately, these implementations are usually notinteroperable. The reason is that when the HDLC frame format was defined, it did notinclude a field to identify the Network layer protocol that it was framing. As such, theOSI version of HDLC assumes that any link using HDLC is running only a singleNetwork layer protocol like IP.
Of course, many networks run IP, IPX, and other Layer 3protocols simultaneously. This has led vendors (including Cisco) to implement HDLCusing a proprietary frame format that includes a type code field, thus allowing theNetwork layer protocol within a frame to be properly identified.The Cisco HDLC frame is illustrated in the figure below.Because of the proprietary nature of vendor HDLC implementations, you should only useHDLC framing on point-to-point links when the router at each end of a link is from thesame vendor.
In cases where you want to connect equipment from different vendors overa leased line, the Point-to-Point Protocol (PPP) should be used. Always remember thatthe router on both sides of a point-to-point link must be using the same data framingmethod in order to communicate.Reference: http://www.2000trainers.com/cisco-ccna-11/ccna-hdlc/QUESTION 668:Actualtests.com - The Power of Knowing640-802The Certkiller WAN connection is shown below:Based on this diagram, which two devices can be used to complete the connectionbetween the WAN router at the customer site and the service provider? (Choosetwo.)A.
CSU/DSUB. modemC. WAN switchD. ATM switchE. Frame Relay switchF. ISDN TAAnswer: A, BExplanation:DTE is an abbreviation for Data Terminal Equipment, and refers to an end instrumentthat converts user information into signals for transmission, or reconverts the receivedsignals into user information.
A DTE device communicates with the DataCircuit-terminating Equipment (DCE), such as a modem or CSU/DSU.A DTE is the functional unit of a data station that serves as a data source or a data sinkand provides for the data communication control function to be performed in accordancewith link protocol.The data terminal equipment (DTE) may be a single piece of equipment or aninterconnected subsystem of multiple pieces of equipment that perform all the requiredfunctions necessary to permit users to communicate. A user interacts with the DTE (e.g.through a Human-Machine Interface), or the DTE may be the user.Usually, the DTE device is the terminal (or a computer emulating a terminal), and theDCE is a modem.A CSU/DSU (Channel Service Unit/Data Service Unit) is a hardware device about thesize of an external modem that converts a digital data frame from the communicationstechnology used on a local area network (LAN) into a frame appropriate to a wide-areanetwork (WAN) and vice versa.
The DSU provides an interface to the data terminalequipment (DTE) using a standard (EIA/CCITT) interface. It also provides testingcapabilities.QUESTION 669:Actualtests.com - The Power of Knowing640-802You are configuring the serial interface of your Cisco router; which of the followingare valid encapsulation types you can use? (Select all that apply)A. Token RingB.
EthernetC. HDLCD. PPPE. Frame RelayF. CHAPAnswer: C, D, EExplanation:HDLC, Frame Relay, and PPP are the most common encapsulation types set for serialinterfaces in a Cisco router. HDLC is often used in point to point circuits with Ciscorouters on each end. HDLC is Cisco proprietary and offers an alternative to PPP.Incorrect Answers:A, B. Token Ring and Ethernet aren't encapsulation types used on serial interfaces; theyare types of LAN networks.F. CHAP is the Challenge Authentication Protocol.
It is used for authentication on PPPlinks.QUESTION 670:Two Certkiller routers are connected as shown in the diagram below:Which series of commands will configure router CK1 for LAN-to-LANcommunication with router CK2 ? The enterprise network address is 192.1.1.0/24and the routing protocol in use is RIPv2. (Choose three)A. CK1 (config)# interface ethernet 0CK1 (config-if)# ip address 192.1.1.129 255.255.255.192CK1 (config-if)# no shutdownActualtests.com - The Power of Knowing640-802B. CK1 (config)# interface ethernet 0CK1 (config-if)# ip address 192.1.1.97 255.255.255.192CK1 (config-if)# no shutdownC.
CK1 (config)# interface serial 0CK1 (config-if)# ip address 192.1.1.4 255.255.255.252CK1 (config-if)# clock rate 56000D. CK1 (config)# interface serial 0CK1 (config-if)# ip address 192.1.1.6 255.255.255.252CK1 (config-if)# no shutdownE. CK1 (config)# router ripCK1 (config-router)# network 192.1.1.4CK1 (config-router)# network 192.1.1.128F. CK1 (config)# router ripCK1 (config-router)# version 2CK1 (config-router)# network 192.1.1.0Answer: A, D, FExplanation:To establish connectivity on router CK1 the first step is to configure the interfaces withthe correct IP address and enable them with the "no shutdown" command as shown inanswer choices A and D.
The final step is to enable the RIP routing process. Since thisnetwork uses VLSM, RIP version 2 will be required to establish connectivity. RIPversion 1 is the default RIP version, but it does not support VLSM.Incorrect Answers:B: The IP address in use here will conflict with the LAN network configured on CK2 .C: the 192.168.1.4/30 address is a network address, not a host address.E: In this example we are required to use RIP version 2, not 1. In addition, the IPnetworks shown are not required. Since RIP assumes classful routing, we only need thesingle 192.168.1.0 network to be added to the routing process.QUESTION 671:A network administrator needs to configure a serial link between the main officeand a remote location.
![](https://s.studizba.com/z.php?f=/templates/si/i/noavatar.png&w=100&h=100&t=1"){kind=avatar}
