New CCNA 640-802 Question Answer 1
Cisco 640-802
Q&A with explanation
QUESTION 3:
When comparing and contrasting the similarities and differences between bridges and switches, which of the following are valid statements? Choose all the valid answer choices)
A. Bridges are faster than switches because they have fewer ports. B. A switch is a multiport bridge,
C. Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.
D. A bridge will forward a broadcast but a switch will not.
E. Bridges and switches increase the size of a collision domain. F. None of the above statements are true.
Answer: B, C Explanation:
Both bridges and switches build the bridge table by listening to incoming frames and
examining the source MAC address in the frame.
Switches are multiport bridges that allow you to create multiple broadcast domains. Each broadcast domain is like a distinct virtual bridge within a switch.
Incorrect Answers:
A. Switches are generally faster than bridges. Bridges also do not necessarily have fewer ports than switches.
D. Both bridges and switches will forward broadcast and multicast traffic, assuming that the traffic remains in the same VLAN.
E. The use of VLANs in a switch can decrease the size of the collision domain, by creating additional, smaller collision domains.
QUESTION 4:
Which of the following correctly describe the various functions and virtues of a router? (Select all valid answer choices)
A. Packet switching
B. Collision prevention on a LAN segment. C. Packet filtering
D. Broadcast domain enlargement
E. Broadcast forwarding
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F. Internetwork communication
G. None of the above
Answer: A, C, F Explanation:
The main function of a router is to connect different, separated networks together. In doing so, switching packets from one network to another is a primary function, along with providing for communication between networks. As an additional feature, routers are capable of providing filtering on a network address and application port level, so choice C is also correct.
Incorrect Answers:
B. Routers can indeed be used to segment a network separate a collision domain, since routers do not forward LAN broadcasts and multicasts to other interfaces. However, routers alone can not prevent all collisions from occurring on any given LAN segment. D. Routers actually segment LANs into smaller broadcast domains.
E. Routers do not forward broadcast and multicast traffic out the additional interfaces by default. Unless bridging or IP helpers are configured on the router, LAN broadcasts are blocked at the router level.
QUESTION 5:
The LAN needs are expanding at the Certifyme corporate office, which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the Certifyme network.
Which of the following are layer 1 devices that you can use? (Choose all that apply.)
A. A switch
B. A router
C. A network adapter card
D. A hub
E. A repeater
Answer: D, E Explanation:
A hub simply repeats the electrical signal and makes no attempt to interpret the electrical signal (layer 1) as a LAN frame (Layer 2). So, a hub actually performs OSI layer 1 functions, repeating an electrical signal, whereas a switch performs OSI layer 2
functions, actually interpreting Ethernet header information, particularly addresses, to make forwarding decisions. Hubs can be used to increase the number of stations that can
be supported on a LAN.
Because the repeater does not interpret what the bits mean, but does examine and generate electrical signals, a repeater is considered to operate at Layer 1. Repeaters can
be used to physically extend the LAN to greater distances.
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QUESTION 6:
Cisco is the leader in the router market space. What basic functions do their routers perform in a network? (Choose two)
A. The microsegmentation of broadcast domains
B. Path selection
C. Packet switching
D. Bridging between LAN segments
E. Access layer security
F. VLAN membership assignment
G. Application optimization
Answer: B, C Explanation:
The primary functions of a router are: Packet Switching and Path Selection. It is the routers job to determine the best method for delivering the data, and switching that data
as quickly as possible.
QUESTION 7:
Both bridges are switches are being used throughout the Certifyme LAN. Which of the following statements are true regarding bridges and switches in this network?
(Choose 3)
A. Switches are primarily software based while bridges are hardware based. B. Switches usually have a higher number of ports than most bridges.
C. Bridges are frequently faster than switches.
D. Bridges define broadcast domains while switches define collision domains. E. Both bridges and switches forward Layer 2 broadcasts.
F. Both bridges and switches make forwarding decisions based on Layer 2 addresses. Answer: B, E, F
QUESTION 8:
As a network administrator, you will need to decide on the appropriate network devices to use. Which of the following correctly describes the roles of devices in a WAN? (Choose three)
A. A CSU/DSU terminates a digital local loop.
B. A router is commonly considered a DCE device. C. A modem terminates an analog local loop.
D. A router is commonly considered a DTE device. E. A modem terminates a digital local loop.
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F. A CSU/DSU terminates an analog local loop.
G. A modem is used to terminate a T1
Answer: A, C, D Explanation:
Layer 2 switching is considered hardware-based bridging because it uses specialized hardware called an application-specific integrated circuit (ASIC). ASICs can run up to gigabit speeds with very low latency rates.
Switches usually have higher port number then bridge. Generally bridges have two ports. Both operates on Data link layer.
QUESTION 9:
The Certifyme network administrator needs to determine what LAN devices to install on the Certifyme network. What are two advantages of using Layer 2
Ethernet switches over hubs? (Choose two)
A. Allowing simultaneous frame transmissions
B. Increasing the size of broadcast domains
C. Increasing the maximum length of UTP cabling between devices
D. Filtering frames based on MAC addresses
E. Decreasing the number of collision domains
Answer: A, D Explanation:
A: A half duplex connection is where only one device can send or receive at a time. A
full duplex connection is where both devices can send and receive at the same time.
Thus, if you have a 100Mb half-duplex connection, only sending at 100Mb OR receiving
at 100Mb can happen at the same time. If you have a 100Mb full duplex connection, you can effectively get 200Mb out of the link because you could be sending 100Mb and receiving 100Mb at the same time.
D: Switches are capable of filtering frames based on any Layer 2 fields. For example, a switch can be programmed to reject (not forward) all frames sourced from a particular network. Because link layer information often includes a reference to an upper-layer protocol, switches usually can filter on this parameter. Furthermore, filters can be helpful
in dealing with unnecessary broadcast and multicast packets.
QUESTION 10:
CDP is being used throughout the Certifyme network. What are two reasons why the
Certifyme network administrator would use CDP? (Choose two)
A. To determine the status of network services on a remote device
B. To obtain the IP Address of a connected device in order to telnet to the device
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C. To verify the type of cable interconnecting two devices
D. To verify Layer 2 connectivity between two devices when Layer 3 fails
E. To obtain VLAN information from directly connected switches
F. To determine the status of the routing protocols between directly connected routers
G. To support automatic network failover during outages
Answer: B, D Explanation:
Cisco Discovery Protocol (CDP) is a proprietary protocol designed by Cisco to help administrators collect information about both locally attached and remote devices. By using CDP, you can gather hardware and protocol information about neighbor devices, which is useful info for troubleshooting and documenting the network.
You can use:
Show cdp neighbor
Show cdp neighbor details
Commands to gather the information of connected neighbors.
QUESTION 11:
CDP is running between two Certifyme devices. What information is supplied by
CDP? (Select three)
A. Device Identifiers
B. Capabilities list
C. Platform
D. Route identifier
E. Neighbor traffic data Answer: A, B, C Explanation:
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QUESTION 12:
Two Certifyme offices are connected as shown below:
Two buildings on the London campus of a the Certifyme corporation must be connected to use Ethernet with a bandwidth of at least 100 Mbps. Certifyme is concerned about possible problems from voltage potential differences between the two buildings. Which media type should be used for the connection?
A. Coaxial cable
B. Fiber optic cable
C. UTP cable
D. STP cable
E. None of the above
Answer: B Explanation:
Current Ethernet technology typically comes via either copper UTP or fiber cables. In
this scenario the distance between the buildings is only 55 meters so either copper or fiber could be used, as the distance limitation for 100M UTP Ethernet is 100 meters.
However, fiber would be a better fit as it is not prone to errors that could occur due to the voltage potential differences. Because fiber is a dielectric material, it’s not susceptible to electrical interference. FO-product vendors also claim that fiber systems make secure communications easier. Interference immunity and lack of emissions are givens in FO systems and in the fiber medium itself.
QUESTION 13:
Refer to the Certifyme network shown below:
You work as a network technician at Certifyme .com. Please study the exhibit carefully. Based on the information shown above, what is needed to allow host
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Certifyme 1 to ping host Certifyme 2?
A. a crossover cable connecting the switches
B. a backbone switch connecting the switches with either fiber optic or straight-through cables
C. a straight-through cable connecting the switches
D. a CSU/DSU connected to the switches with straight-through cables
E. a router connected to the switches with straight-through cables
Answer: E Explanation:
Routers are Layers 3 devices used for inter-network communication. In this scenario there are two different networks, so both switches need to connect to a router using straight-through cables.
A straight-through cable is used to connect two different devices like, switch to router, host to switch. Since we need to insert a router for communication between the two switches, straight through cables will be used between the switches and the router.
QUESTION 14:
Exhibit:
A new Certifyme office is opening, and a network device needs to be installed in the place of the icon labeled Network Device to accommodate a leased line T1 to the Internet. Which network device and interface configuration meets the minimum requirements for this installation?
A. A switch with two Ethernet interfaces
B. A router with two Ethernet interfaces
C. A switch with one Ethernet and one serial interface D. A router with one Ethernet and one serial interface E. A router with one Ethernet and one modem interface
F. None of the above
Answer: D
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Explanation:
Only a router can terminate a leased line T1 access circuit, and only a router can connect two different IP networks. Here, we will need a router with two interfaces, one serial connection for the T1 and one Ethernet interface to connect to the switch on the LAN.
QUESTION 15:
As a CCNA candidate, you must know the various layers of the OSI model. At which layers of the OSI Model do Wide Area Networks operate in? (Choose two)
A. Physical Layer B. Datalink Layer C. Network Layer D. Session Layer E. Transport Layer
F. Presentation Layer
G. Application Layer
Answer: A, B Explanation:
A WAN is a data communications network that covers a relatively broad geographic area and that often uses transmission facilities provided by common carriers, such as
telephone companies. WAN technologies generally function at the lower two layers of the OSI reference model: the physical layer and the data link layer as shown below.
Note: Occasionally WAN’s would also be considered to operate at layer 3, but since this question asked for only 2 choices layers 1 and 2 are better choices.
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QUESTION 16:
While troubleshooting a connectivity problem on the network, you issue the ping command from your PC command prompt, but the output shows “request times out.”
At which OSI layer is this problem associated with?
A. The data link layer
B. The application layer
C. The access layer D. The session layer E. The network layer
Answer: E Explanation:
TCP/IP includes ICMP, a protocol designed to help manage and control the operation of
a TCP/IP network. The ICMP protocol provides a wide variety of information about a network’s health and operational status. Control message is the most descriptive part of a name. ICMP helps control and manage IP’s work and therefore is considered part of TCP/IP’s network layer.
Reference:
CCNA Self-Study CCNA ICND exam certification Guide (Cisco Press, ISBN
1-58720-083-X) page 277.
QUESTION 17:
You download a file from an FTP site on the Internet. What is the highest layer in the
OSI model used in this FTP operation?
A. Application B. Presentation C. Session
D. Transport
E. Internet
F. Data Link
G. Physical
Answer: A
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