Everyday Ten Ask ccie rs exam topics

1. Question: What is the DHCP assignment address order?

Answer: 

(1) In oder to the unallocated address in the address pool from small to large.

(2) The unallocated address is allocated and then back to the address that IDLE to start from small to large.

2. Question: IPv6 configuration is not available. Is the state address configured to 32-bit mask unable to get the address?

Answer: The stateless DHCP address pool can only allocate 64-bit masked addresses because the host bits that get the stateless IPv6 address are calculated by the 48-bit mac address plus the 16-bit fixed bit so it can only be 64 bit.

3. Question: The computer is connected to a common Layer 2 switch. You need to click the network repair to connect to the network. You can also restore the normal Layer 2 switch.

Answer: The version of the terminal NIC is too old and the problem can be solved after the update.

4. Question: How does the switch configure jumbo frames?

Answer: The switch configures jumbo frames to configure mtu to the maximum under the interface.

5. Question: How is static routing load balanced?

Answer: If multiple static routes are configured on the device at the same time, the destination address mask is the same. Then the packets are load-balanced when they are sent from the device. The mode of load balancing is the same as that of the aggregation port and the adjustment method is the same.

6. Question: Do port aggregations connect a HUB to do aggregation?

Answer: When the port is aggregated, a small HUB can be aggregated in the middle. However, in order to ensure that the intermediate line is broken, it can be to detect that you need to configure dynamic link aggregation to detect the link.

7. Question: When the switch is configured with port speed limit (QOS), will the interface be equipped with a speed limit and a burst value?

Answer: This is the interface cache. If the value of the interface speed limit + cache value is exceeded, the data packet will be discarded directly.

8. Question: What is the aging time of port security?

Answer: By default, the aging time is valid only for the dynamically learned address. If you want to configure the static address to be effective at the same time, you need to configure the switchport port-security aging. Static?

Note: If you do not set the aging time, the default is not aging.

9. Question: Does port security support dynamic learning binding?

Answer: Port security three-layer binding (only bind ip or bind ip+mac) supports static binding, cannot dynamically learn binding but layer bindings can support static binding or dynamic learning binding. Based on the above characteristics, it can be concluded that:

(1) When the static binding is a Layer 2 address and the security address is limited to 1, the port cannot dynamically learn other addresses.

(2) When the static binding is a three-layer address, the time-based security address is limited to 1, and the port dynamically learns other addresses.

( When a static binding has both a Layer 2 address and a Layer 3 address and the secure address is limited to 1, the port cannot dynamically learn other addresses.

10. Question: How do I get the address obtained by DHCP from being obtained by other hosts?

Answer: If the lease issued to the user on the switch is permanent, when a user obtains it, no other user can obtain it. The address obtained by the user after leaving for a period of time is still the original one. Because the address will not be released when the lease period has not expired.

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