The Cisco 640-822 certification can make you a competent person. It may enable a technician to know about the Cisco 640-822 configurations, get information about the Cisco 640-822 data center products and hardware and knowledge about Cisco 640-822 united computing systems.
Exam A
QUESTION 1
After the router interfaces shown in the diagram have been configured, it is discovered that hosts in the Branch LAN cannot access the Internet. Further testing reveals additional connectivity issues. What will fix this problem?
A. Change the address of the HQ router LAN interface.
B. Change the subnet mask of the HQ router LAN interface.
C. Change the address of the Branch router LAN interface.
D. Change the address of the HQ router interface to the Internet.
E. Change the address of the Branch router WAN interface.
F. Change the subnet mask of the HQ router interface to the Internet.
Correct Answer: E Section: (none) Explanation
Explanation/Reference:
QUESTION 2
Refer to the graphic. A Cisco router and a Catalyst switch are connected as shown. The technician is working on a computer that is connected to the management console of the switch. In order to configure the default gateway for the switch, the technician needs to learn the IP address of the attached router interface. Which IOS command will provide this information in the absence of Layer 3 connectivity?
A. showcdp neighbors detail
B. pingrouter_ip_address
C. showip neighbors
D. pingswitch_ip_address
E. showdhcp-config
F. showip rarp
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation: To display detailed information about neighboring devices discovered using Cisco Discovery Protocol (CDP), use the show cdp neighbors privileged EXEC command. Detail – (Optional) Displays detailed information about a neighbor (or neighbors) including network address, enabled protocols, hold time, and software version.
The following is sample output for the show cdp neighbors detail command. router# show cdp neighbors detail
Device ID: lab-7206 Entry address( es ): IP address: 172.19.169.83 Platform: cisco 7206VXR, Capabilities: Router Interface: Ethernet0, Port ID (outgoing port): FastEthernet0/0/0 Holdtime : 123 sec Version : Cisco Internetwork Operating System Software IOS ™ 5800 Software (C5800-P4-M), Version 12.1(2) Copyright (c) 1986-2002 by Cisco Systems, Inc. advertisement version: 2 Duplex: half
QUESTION 3
Refer to the exhibit. The ports that are shown are the only active ports on the switch. The MAC address table is shown in its entirety. The Ethernet frame that is shown arrives at the switch.
What two operations will the switch perform when it receives this frame? (Choose two.)
A. The frame will be forwarded out port fa0/3 only.
B. The frame will be forwarded out fa0/1, fa0/2, and fa0/3.
C. The frame will be forwarded out all the active ports.
D. The MAC address of 0000.00dd.dddd will be added to the MAC address table.
E. The MAC address of 0000.00aa.aaaa will be added to the MAC address table.
Correct Answer: BE Section: (none) Explanation
Explanation/Reference:
QUESTION 4
Refer to the exhibit. Workstation A must be able to telnet to switch SW-A through router RTA for management purposes. What must be configured for this connection to be successful?
A. IP routing on SW-A
B. default gateway on SW-A
C. VLAN 1 on RTA
D. cross-over cable connecting SW-A and RTA
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
Configure a default gateway on SW-A.
In order for a switch to send traffic to a destination that is not located directly, as is the case in our
example, a default gateway must be configured on the switch. This will enable it to send the traffic to router
RTA where it can be routed to host A.
QUESTION 5
What does the “Inside Global” address represent in the configuration of NAT?
A. a globally unique, private IP address assigned to a host on the inside network
B. the summarized address for all of the internalsubnetted addresses
C. a registered address that represents an inside host to an outside network
D. the MAC address of the router used by inside hosts to connect to the Internet
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation: With NAT, Cisco defines 4 different types of addresses as follows: Inside local address – The IP address assigned to a host on the inside network. This is the address configured as a parameter of the computer’s OS or received via dynamic address allocation protocols such as DHCP. The address is likely not a legitimate IP address assigned by the Network Information Center (NIC) or service provider. Inside global address – A legitimate IP address assigned by the NIC or service provider that represents one or more inside local IP addresses to the outside world. Outside local address – The IP address of an outside host as it appears to the inside network. Not necessarily a legitimate address, it is allocated from an address space routable on the inside. Outside global address – The IP address assigned to a host on the outside network by the host’s owner. The address is allocated from a globally routable address or network space. The above definitions still leave a lot to be interpreted. For this example, this document redefines these terms by first defining “local address” and “global address.” Keep in mind that the terms “inside” and “outside” are NAT definitions. Interfaces on a NAT router are defined as “inside” or “outside” with the NAT configuration commands, ip nat inside and ip nat outside . Networks to which these interfaces connect can then be thought of as “inside” networks or “outside” networks, respectively. Local address – A local address is any address that appears on the “inside” portion of the network. Global address – A global address is any address that appears on the “outside” portion of the network.
QUESTION 6
Refer to the exhibit. What does the address 192.168.2.167 represent?
A. the router to which the file startup-config is being transferred
B. the TFTP server from which the file router-confg is being transferred
C. the TFTP server to which the file router-confg is being transferred
D. the TFTP server from which the file startup-config is being transferred
E. the router from which the file startup-config is being transferred
F. the router to which the file router-confg is being transferred
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 7
Two routers named Atlanta and Brevard are connected by their serial interfaces as shown in the exhibit, but there is no data connectivity between them. The Atlanta router is known to have a correct configuration. Given the partial configurations shown in the exhibit, what is the problem on the Brevard router that is causing the lack of connectivity?
A. The bandwidth setting is incompatible with the connected interface.
B. The maximum transmission unit (MTU) size is too large.
C. The subnet mask is incorrect.
D. The serial line encapsulations are incompatible.
E. A loopback is not set.
F. The IP address is incorrect.
Correct Answer: F Section: (none) Explanation
Explanation/Reference:
QUESTION 8
The administrator is unable to establish connectivity between two Cisco routers. Upon reviewing the command output of both routers, what is the most likely cause of the problem?
A. Username/password is incorrectly configured.
B. Router names are incorrectly configured.
C. Serialip addresses
D. Authentication needs to be changed to PAP for both routers.
Correct Answer: A Section: (none)Explanation
Explanation/Reference:
Explanation: When setting up local password database in CHAP, configure commands username username password password in overall configuration mode to add note to local password database. Note that the username here should be the router name on the opposite side. And the password should be the same as that in the password database of CHAP authentication server. The above graphic shows different password.
QUESTION 9
Which of the following are types of flow control? (Choose three.)
A. cut-through
B. load balancing
C. congestion avoidance
D. buffering
E. windowing
Correct Answer: CDE Section: (none) Explanation
Explanation/Reference:
QUESTION 10
DRAG DROP
Drop
A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
Explanation:
QUESTION 11
Refer to the exhibit. The junior network support staff provided the diagram as a recommended configuration for the first phase of a four-phase network expansion project. The entire network expansion will have over 1000 users on 14 network segments and has been allocated this IP address space:
192.168.1.1 through 192.168.5.255
192.168.100.1 through 198.168.100.255
What are three problems with this design? (Choose three.)
A. The AREA 3 IP address space is inadequate for the number of users.
B. The network address space that is provided requires a single network-wide mask.
C. The router-to-router connection is wasting address space.
D. AREA 2 could use a mask of /25 to conserve IP address space.
E. The AREA 1 IP address space is inadequate for the number of users.
F. The broadcast domain in AREA 1 is too large for IP to function.
Correct Answer: CDE Section: (none) Explanation
Explanation/Reference:
Explanation:
Besides network address and broadcast address, network 192.168.1.0/24 allows only 254 hosts. Thus it is
evident that AREA 1 IP address space is inadequate for 500 users. If AREA 2 uses a mask of /25, i.e.
255.255.255.128, it will be able to accommodate IP space of 128 (256-128=128), which is adequate for 60
users. And as the two routers need only two IP, to use 192.168.100.0/26 is a waste of address space.
So the answer would be A ,C and E.
*
Since there are only 60 users on this LAN, a /25 could be used as that will provide for up to 128 IP addresses (126 usable). In fact, since there are only 60 users, a /26 could be used as that will provide for up to 62 usable IP addresses. However, this would not accommodate any kind of growth and could cause problems in the future.
*
On point to point serial router links, a /30 is generally used as this will allow for only 2 usable IP addresses, which is all that is needed. In this case, a /26 has been assigned.
*
In this area, there are 500 users, but a /24 will only provide for 254 usable IP addresses. A /23 or larger
will be needed to accommodate this many users.
QUESTION 12
Which type of attack is characterized by a flood of packets that are requesting a TCP connection to a server?
A. brute force
B. Trojan horse
C. denial of service
D. reconnaissance
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation: A denial-of-service attack ( DoS attack) is an attempt to make a computer resource unavailable to its intended users. Although the means to, motives for and targets of a DoS attack may vary, it generally comprises the concerted, malevolent efforts of a person or persons to prevent an Internet site or service from functioning efficiently or at all, temporarily or indefinitely. Among these are Network connectivity attacks. These attacks overload the victim with TCP packets so that its TCP/IP stack is not able to handle any further connections, and processing queues are completely full with nonsense malicious packets. As a consequence of this attack, legitimate connections are denied. One classic example of a network connectivity attack is a SYN Flood
QUESTION 13
Refer to the graphic. How many collision domains are shown?
A. two
B. four
C. six
D. fourteen
E. three
F. one
Correct Answer: A Section: (none)Explanation
Explanation/Reference:
Explanation: The multi-segment configuration guidelines apply only to a single Ethernet “collision domain.” A ActualTests.com collision domain is formally defined as a single CSMA/CD network in which there will be a collision if two computers attached to the system transmit at the same time. An Ethernet system composed of a single segment or multiple segments linked with repeaters is a network that functions as a single collision domain.
FIGURE 1 Repeater hubs create a single collision domain
The figure shows two repeater hubs connecting three computers. Since only repeater connections are used between segments in this network, all of the segments and computers are in the same collision domain. In the next figure, the repeaters and DTEs are instead separated by a router (packet switch) and are therefore in separate collision domains, since routers do not forward collision signals from one segment to another. Routers contain multiple Ethernet interfaces and are designed to receive a packet on one Ethernet port and transmit the data onto another Ethernet port in a new packet.
FIGURE 2 Routers creates separate collision domains
Instead of propagating collision signals between Ethernet segments, routers interrupt the collision domain and allow the Ethernets they link to operate independently. Therefore, you can use packet switching hubs to build larger network systems by interconnecting individual Ethernet systems.
QUESTION 14
DRAG DROP Drop
A.
B.
C.
D.
Correct Answer: Section: (none)Explanation
Explanation/Reference: QUESTION 15
A network administrator has subnetted the 172.16.0.0 network using a subnet mask of 255.255.255.192. A duplicate IP address of 172.16.2.120 has accidentally been configured on a workstation in the network. The technician must assign this workstation a new IP address within that same subnetwork. Which address should be assigned to the workstation?
A. 172.16.2.127
B. 172.16.2.80
C. 172.16.2.128
D. 172.16.1.64
E. 172.16.1.80
F. 172.16.2.64
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
A subnet mask of 255.255.255.192 (/26) will provide us with 4 subnet (2 usable) each with 62 usable hosts
per network. So in our example the four networks will be:
172.16.2.1-62
172.16.2.65-126
172.16.2.129-190 172.16.2.193-254
Since we know that the host must be in the same IP subnet as 172.16.2.120, only choice C is correct.
QUESTION 16
Host A needs to communicate with the email server shown in the graphic. What address will be placed in the destination address field of the frame when it leaves Host A?
A. the MAC address of the email server
B. the MAC address of E1 of the router
C. the MAC address of Switch 1
D. the MAC address of E0 of the router
E. the MAC address of Switch 2
F. the MAC address of Host A
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation:
Since the email server resides on a different IP subnet than the host A, the host will send the frame to its
default gateway. In this case, the router C is acting as the default gateway for all hosts on the LAN, so the
frame will be sent to its Ethernet interface so that it can be routed to the email server.
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