READ Free Dumps For Cisco- 200-125
| Question ID 13514 | For what two purposes does the Ethernet protocol use physical addresses? (Choose two.)
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| Option A | to uniquely identify devices at Layer 2
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| Option B | to allow communication with devices on a different network
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| Option C | to differentiate a Layer 2 frame from a Layer 3 packet
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| Option D | to establish a priority system to determine which device gets to transmit first
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| Option E | to allow communication between different devices on the same network
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| Option F | to allow detection of a remote device when its physical address is unknown
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| Correct Answer | A,E |
Explanation Explanation: Physical addresses or MAC addresses are used to identify devices at layer 2. MAC addresses are only used to communicate on the same network. To communicate on different network we have to use Layer 3 addresses (IP addresses) -> B is not correct. Layer 2 frame and Layer 3 packet can be recognized via headers. Layer 3 packet also contains physical address ->. On Ethernet, each frame has the same priority to transmit by default ->. All devices need a physical address to identify itself. If not, they cannot communicate ->.
| Question ID 13515 | In an Ethernet network, under what two scenarios can devices transmit? (Choose two.)
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| Option A | when they receive a special token
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| Option B | when there is a carrier
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| Option C | when they detect no other devices are sending
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| Option D | when the medium is idle
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| Option E | when the server grants access
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| Correct Answer | C,D |
Explanation Explanation: Ethernet network is a shared environment so all devices have the right to access to the medium. If more than one device transmits simultaneously, the signals collide and cannot reach the destination. If a device detects another device is sending, it will wait for a specified amount of time before attempting to transmit. When there is no traffic detected, a device will transmit its message. While this transmission is occurring, the device continues to listen for traffic or collisions on the LAN. After the message is sent, the device returns to its default listening mode.