Cisco CCNA exploration v 4.0, module 1, chapter 7 Exam.
Questions and answers 100% correct.
| 1. | Which options are properties of contention-based media access for a shared media? (Choose three.) | |
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non-deterministic | |
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less overhead | |
| one station transmits at a time | ||
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collisions exist | |
| devices must wait their turn | ||
| token passing | ||
| 2. | What is a primary purpose of encapsulating packets into frames? | |
| provide routes across the internetwork | ||
| format the data for presentation to the user | ||
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facilitate the entry and exit of data on media | |
| identify the services to which transported data is associated | ||
| 3. |
Refer to the exhibit. How many unique CRC calculations will take place as traffic routes from the PC to the laptop? |
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| 1 | ||
| 2 | ||
| 4 | ||
| 6 | ||
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8 | |
| 16 | ||
| 4. | What is true concerning physical and logical topologies? | |
| The logical topology is always the same as the physical topology. | ||
| Physical topologies are concerned with how a network transfers frames. | ||
| Physical signal paths are defined by Data Link layer protocols. | ||
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Logical topologies consist of virtual connections between nodes. | |
| 5. |
|
|
| 00-1c-41-ab-c0-00 | ||
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00-0c-85-cf-65-c0 | |
| 00-0c-85-cf-65-c1 | ||
| 00-12-3f-32-05-af | ||
| 6. | What are three characteristics of valid Ethernet Layer 2 addresses? (Choose three.) | |
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They are 48 binary bits in length. | |
| They are considered physical addresses. | ||
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They are generally represented in hexadecimal format. | |
| They consist of four eight-bit octets of binary numbers. | ||
| They are used to determine the data path through the network. | ||
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They must be changed when an Ethernet device is added or moved within the network. | |
| 7. |
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| source MAC - PC | ||
| source MAC - S0/0 on RouterA | ||
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source MAC - Fa0/1 on RouterB | |
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source IP - PC | |
| source IP - S0/0 on RouterA | ||
| source IP - Fa0/1 of RouterB | ||
| 8. | What determines the method of media access control? (Choose two.) | |
| network layer addressing | ||
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media sharing | |
| application processes | ||
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logical topology | |
| intermediary device function | ||
| 9. | What is the purpose of the preamble in an Ethernet frame? | |
| is used as a pad for data | ||
| identifies the source address | ||
| identifies the destination address | ||
| marks the end of timing information | ||
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is used for timing synchronization with alternating patterns of ones and zeros | |
| 10. | What statements are true regarding addresses found at each layer of the OSI model? (Choose two.) | |
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Layer 2 may identify devices by a physical address burned into the network card | |
| Layer 2 identifies the applications that are communicating | ||
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Layer 3 represents a hierarchical addressing scheme | |
| Layer 4 directs communication to the proper destination network | ||
| Layer 4 addresses are used by intermediary devices to forward data | ||
| 11. | Which statements describe the logical token-passing topology? (Choose two.) | |
| Network usage is on a first come, first serve basis. | ||
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Computers are allowed to transmit data only when they possess a token. | |
| Data from a host is received by all other hosts. | ||
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Electronic tokens are passed sequentially to each other. | |
| Token passing networks have problems with high collision rates. | ||
| 12. | Which sublayer of the data link layer prepares a signal to be transmitted at the physical layer? | |
| LLC | ||
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MAC | |
| HDLC | ||
| NIC | ||
| 13. | What is true regarding media access control? (Choose three.) | |
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Ethernet utilizes CSMA/CD | |
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defined as placement of data frames on the media | |
| contention-based access is also known as deterministic | ||
| 802.11 utilizes CSMA/CD | ||
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Data Link layer protocols define the rules for access to different media | |
| controlled access contains data collisions | ||
| 14. | What is a characteristic of a logical point-to-point topology? | |
| The nodes are physically connected. | ||
| The physical arrangement of the nodes is restricted. | ||
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The media access control protocol can be very simple. | |
| The data link layer protocol used over the link requires a large frame header. | ||
| 15. | What two facts are true when a device is moved from one network or subnet to another? (Choose two.) | |
| The Layer 2 address must be reassigned. | ||
| The default gateway address should not be changed. | ||
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The device will still operate at the same Layer 2 address. | |
| Applications and services will need additional port numbers assigned. | ||
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The Layer 3 address must be reassigned to allow communications to the new network. | |
| 16. | What is a function of the data link layer? | |
| provides the formatting of data | ||
| provides end-to-end delivery of data between hosts | ||
| provides delivery of data between two applications | ||
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provides for the exchange data over a common local media | |
| 17. | Which three factors should be considered when implementing a Layer 2 protocol in a network? (Choose three.) | |
| the Layer 3 protocol selected | ||
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the geographic scope of the network | |
| the PDU defined by the transport layer | ||
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the physical layer implementation | |
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the number of hosts to be interconnected | |
| 18. | What is the primary purpose of the trailer in a data link layer frame? | |
| define the logical topology | ||
| provide media access control | ||
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support frame error detection | |
| carry routing information for the frame | ||
| 19. | A network administrator has been asked to provide a graphic representation of exactly where the company network wiring and equipment are located in the building. What is this type of drawing? | |
| logical topology | ||
|
physical topology | |
| cable path | ||
| wiring grid | ||
| access topology | ||
| 20. |
Refer to the exhibit. Which statement describes the media access control methods that are used by the networks in the exhibit? |
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| All three networks use CSMA/CA | ||
| None of the networks require media access control. | ||
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Network 1 uses CSMA/CD and Network 3 uses CSMA/CA. | |
| Network 1 uses CSMA/CA and Network 2 uses CSMA/CD. | ||
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Network 2 uses CSMA/CA and Network 3 uses CSMA/CD. |
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