READ Free Dumps For Cisco- 400-101
| Question ID 18537 | Drag and drop the Cisco IOX XE subpackage on the left to the function it performs on the
right.
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| Option A | Answer :
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| Correct Answer | A |
Explanation
| Question ID 18538 | Which two methods change the IP MTU value for an interface? (Choose two.)
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| Option A | Configure the default MTU.
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| Option B | Configure the IP system MTU.
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| Option C | Configure the interface MTU.
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| Option D | Configure the interface IP MTU.
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| Correct Answer | C,D |
Explanation Explanation: An IOS device configured for IP+MPLS routing uses three different Maximum Transmission Unit (MTU) values: The hardware MTU configured with the mtu interface configuration command ✑ The IP MTU configured with the ip mtu interface configuration command ✑ The MPLS MTU configured with the mpls mtu interface configuration command The hardware MTU specifies the maximum packet length the interface can support or at least that's the theory behind it. In reality, longer packets can be sent (assuming the hardware interface chipset doesn't complain); therefore you can configure MPLS MTU to be larger than the interface MTU and still have a working network. Oversized packets might not be received correctly if the interface uses fixed-length buffers; platforms with scatter/gather architecture (also called particle buffers) usually survive incoming oversized packets. IP MTU is used to determine whether am IP packet forwarded through an interface has to be fragmented. It has to be lower or equal to hardware MTU (and this limitation is enforced). If it equals the HW MTU, its value does not appear in the running configuration and it tracks the changes in HW MTU. For example, if you configure ip mtu 1300 on a Serial interface, it will appear in the running configuration as long as the hardware MTU is not equal to 1300 (and will not change as the HW MTU changes). However, as soon as the mtu 1300 is configured, the ip mtu 1300 command disappears from the configuration and the IP MTU yet again tracks the HW MTU. Reference: http://blog.ipspace.net/2007/10/tale-of-three-mtus.html Topic 2, Layer 2 Technologies