Everyday Ten Ask ccie security guide

1. Question: When the port appears CRC, drop, error, oversized.

Answer: Physical replacement test that to determine if there is a problem at the physical level, you can also check whether the mtu value is too small and whether there is a vlan tailored.

2. Question: Modify the mtu value on the aggregation interface, will the mtu value change when the physical interface is displayed?

Answer: Modify the mtu value on the aggregation interface, the mtu of the show physical interface is still ten default values. The show aggregation interface shows the modified value, the mtu value of the physical interface is modified before the aggregation and the mtu of the show physical interface after the aggregation is still the default value.

3. Question: What is the mpls mtu value of the interface?

Answer: The mpls mtu of the interface is consistent with the interface mtu and the default value range is 64-1500 which can be modified.

4. Question: OsPF redistribution did not publish all routing entries?

Answer: When ospf redistributes routes, subnet parameters need to be configured and not configuring results in only the main route is published. The subnet detail routes are not published to neighbors.

    router bgp 65301

       Redistribute ospf 110 subnets

5. Question: Is the OsPF redistribution call ACL unsuccessful?

Answer: Ospf route redistribution cannot call ACLs directly but it can only invoke ACLs indirectly with route-map to implement route filtering.

6. Question: OSPF Area Number Conversion

Answer: Another expression of area number, such as area 0.0.17.159 at this time needs to change it to binary and then converted to decimal, i.e. 10001 1001 1111 to decimal 4511, equivalent to area 4511

7. Question: What is the way not to conduct DR and BDR elections under the ospf broadcast mode?

Answer: Interface priority 0, no DR and BDR election. Under interface ip ospf pri 0

8. Question: How do I modify the cost value of ospf?

Answer: Use under the neighbor port of ospf: ip ospf cost and cost value (range 0-65535)

9. Question: What command is used to display aggregaterouting information for all redistributed routes for OSPF?

Answer: Re privileged user mode: show ip ospf summary-address

10. Question: How do DR and BDR elections are set up in broadcast networks?

Answer: (1) The greater the priority, the higher the priority.

(2) Routers with the highest router ID are voted DR with the same priority.

(3) Configure priority commands under the interface: ip ospf pri XX, default to 1. If the priority is set to 0, the election is not participated.

(4) DR/BDR is not preemption, when the DR fails, BDR becomes DR and a BDR is produced.

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