ccie routing and switching lab booking Everyday Ten Ask

1. Question: STP View Command: What does the meaning of the p2p and shar of type respectively?

Answer: Type field and link capability related, directly connected are p2p, half duplex automatically recognized as shar.
2. Question: What does a NAK message appear in the DHCP?
Answer: NAK: No Answer Message
     When the terminal sends a request message to the server, the server verifies that the ip address resource is allocatable . If not, sends a NAK message. The terminal must re-launch the discovery message.
3. Question: How do the switch configure address recycling that has been allocated?
Answer: clear ip dhcp binding s ip (clear dhcp binding table)
     Address switches that have been assigned cannot be recycled directly and can only wait for the address on the other side of the computer to expire to reapply for assignment or manually release the terminal ip address.
4. Question: What is it like to add 01 before show ip dhcp binding is added to each terminal mac address?
Answer: 01 represents an Ethernet type. This is related to the type of network card of the terminal.
5. Question: The same vlan configuration second address, one address pool per segment of the network. What is the order in which the address pool is assigned?
Answer: The primary address pool is prioritized and when the primary address pool utilization rate reaches 90%, the alternate address pool is assigned sequentially.
6. Question: The dhcp server lease is set for 4 hours, after obtaining the address and then four hours after the re-acquired address. Why the re-acquired address is still the original address?
Answer: The address obtained by the terminal will be in the host's local cache. When the terminal leaves the network and after the lease period, the address is automatically released but when the terminal again access to the network will be with its own local address to the server to initiate request for the address, the address if it is idle mode will be issued directly . If the address has been obtained by someone else, you will eventually need to request another address.
7. Question: Can loopback interface dhcp relay be?
Answer: No, because loopback does not support the gateway address of the device, the relay must be configured on the gateway.
8. Question: What does the option191 field in the dhcp configuration mean?
Answer: This 191 field is a reserved field, can be customized field, this customization is as defined? Is the client according to the business to define, belongs to the meaning of the application level, the switch is responsible for transmission so the specific meaning or depends on what the next terminal is running. In what requirements to define this field.
Question: When dHCP resets a fixed assigned address which address is obtained by the terminal in the address pool?
Answer: When DHCP fixed assigns ip addresses, gateway address is from the configured total address pool. The gateway statement is not configured in the address pool of the fixed ip address and the terminal can also get the gateway address.
10. Question: When dHCP resets a fixed allocation ip address,which address pool does the DNS obtained by the terminal come from?
Answer: The DNS obtained by the terminal comes from the DNS statement in the address pool of the fixed ip address which means that if DNS is not configured in the address pool of the fixed ip address, the terminal will not get the ip address.
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