ccna security exam dump

ccna security exam dump.The first two bytes of all four networks are the same (192.168); in the third byte, the first six bits are the same, so a total of 22 bits are the same. Notice that this summary route has a subnet mask of 255.255.252.0,which along with the first network number (192.168.0.0) covers the address 192.168.0.0 ~192.168.3.255 behind the router.7.2.3 Hierarchical AddressingTo perform route summarization, hierarchical addressing must be used. Hierarchical addressing brings the following benefits: . . it improves routing efficiency; . Use route summarization to reduce the size of the routing table; . Reduces the amount of memory required to store the routing table; . Reduces the impact of rebuilding routing tables on routers; . Provides a design that simplifies management and troubleshooting.Exam Points Be sure to understand the benefits that hierarchical addressing provides.Figure 7.8 shows a simple example of hierarchical addressing, where the network uses 10.0.0.0/8, which is the summary route advertised to other networks. This addressing space is divided among three campus networks: 10.1.0.0/16, 10.2.0.0/16, and 10.3.0.0/16, which are shared summary routes among the campus networks. The addressing space of each campus is further divided into two buildings: 10.x.1.0/24 and 10.X.2.0/24.The summary routes that the AS advertises to the outside10.0.0.0/8Building 2 Building 1 10.1.2.0/24 10.2.1.0/24Building 1 Building 2 Building 1 Building 2 10.1.1.0/24 10.2.2.0/24 10.3.1.0/24 10.3.2.0/24 Figure 7.8 Simple Hierarchical Addressing ExampleTo implement a hierarchical addressing design and the use of route summarization, which requires the use of VLSM-enabled routing protocols: BGP, EIGRP, IS-IS, OSPF, or RIPv2 to implement route summarization, the following aspects need to be considered.