The core switches should all adopt a modular structure that must have a considerable number of slots, have strong network expansion capabilities, and can select modules of different numbers, different rates and different interface types according to actual or future needs. To adapt to ever-changing network requirements.  

Now more and more employees are already on the move:

1.Up to 90% of employees work outside the company's headquarters;

2.Up to 60% of employees need to collaborate regularly with people from different regions and even different time zones;

3.The growth rate of online video traffic of large enterprises is as high as 70% per year;

 At present, enterprise network security issues have become a common concern of corporate management and IT teams. How to prevent and prevent security vulnerabilities and threats, how to choose effective security products to solve problems is plaguing enterprise management and IT team?

Talos is a core threat intelligence organization that serves as the Cisco security portfolio. Talos' name comes from the mechanical giant in Greek mythology, and its sole mission is to protect the coast of Crete from invaders and pirates. Like the mechanical giant, Cisco Talos is committed to providing superior protection to its customers through products and services.

Before the test:

TS, LAB must be done through. When there is a clear concept of the origin and transmission of structure and routing, that is almost the same. You can make an appointment for the examination room. This state is not only stable but more worried that the examiner added the mistake.

I recently met an old friend who is the IT director of a big company. Because I haven't seen it for a long time that  my old friend has a lot of trouble.

 A day about hard work and IT

 Cisco Group Management Protocol CGMP is primarily used to restrict the forwarding of IP multicast packets only to ports connected to IP multicast clients.  These clients automatically join and leave groups that receive IP multicast traffic, and the switch dynamically changes its forwarding behavior based on the request.

1. Question: How does the bgp routing table redistribute the default route?

 Answer: Method 1: Static routing network

      Ip route 0.0.0.0 0.0.0.0 + next hop

      Then in the bgp process network 0.0.0.0 can inject this default route into the bgp process

      The default route introduced in bgp using this method will be passed to all bgp neighbors.

      Method two: default-information originate

DIAG 1

The first question is if SW3 has port-security or DIAG1 is not DIAG1+

The second question is if e16/0 of R16 ，the mask is /30 is DIAG1, if it is /29 it will be DIAG1+

DIAG1 Answer -------------

T1 STP

Q1: SW3, command: show ip int bri

Q2: What information is used to confirm the problem: HOST1, what the mac add of e0/0

T2 DMVPN