Networks behind R1 will be summarized into a single 172.16.0.0/21 entry. Networks behind R1 will be summarized into a single 172.16.0.0/16 entry. What tunneling type is this organization using? The corporate office is connected to the two branch offices through the Internet, as shown in Figure 8.4. Your organization has moved to IPv6 addressing. Which of the following explains the router's refusal to take the IP address? ○Ĭlass C addresses cannot be assigned to Ethernet interfaces. For some reason, the Ethernet interface will not accept the IP address of 192.168.5.95/27 that you've assigned. You are troubleshooting your router's interfaces. If you use a Class C IP network, which subnet masks will provide one usable subnet per department while allowing enough usable host addresses for each department specified in the table? (Choose three.) (Choose three.) ○Ī new network is being designed for your company, Acme, Inc. Identify three valid host addresses in any subnet of the 201.168.27.0 network, assuming a fixed subnet mask of 255.255.255.240. What custom subnet mask should you use? ○ You need to have at least four subnets with 14 hosts in each subnet. This supplies you with a single subnetwork with 62 hosts. The vice president of IT calls to tell you that you will be in charge of the 192.168.1.64/26 subnetwork. You are designing an IP address scheme for your new remote office. Which of the following describe the most efficient route summarization possibilities? (Choose two.) Your organization wants to implement route summarization capabilities between these two areas. RouterA is acting as an OSPF ABR between Area 1 and Area 0 as shown in Figure 8.3. Which of the following are valid IPv6 addresses? (Choose three.) ○Ī router that is running both IPv4 and IPv6 addressing on the same interface is known as what type of router? ○ This means we need to add 5 to /48 which makes /53.Which of the following are invalid IPv6 communication types? (Choose two.) ○ Summary = 0010 0000 0000 0000 = 2000 (In Hex)Ĥ) Calculate subnet mask by adding the common bits to the lower of our subnet range. So we know our subnet will be somewhere between /48 and /64.ģ) Find the common bits then Set the rest bits to 0 and calculate the summary by converting into hex. In our example 1st three hexadecimal places are same hence summarization can be done in the 4th hexadecimal place. We have to summarize the following routes:ġ) Identify where you can do the summarization. To summarized prefix there are two steps:Ī) You need to find Summary prefix and prefix lenghī) Configure the “summary-prefix ” command under OSPFv3 process: O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2 R1 learns following route from router X_WAN_R4 using EIGRPv6 which then redistributed to OSPV3 to advertise this routes in OSPF domain.īefore summarization R2’s and R3’s routing table shows these prefixes as individual externally learn prefixes: We are redistributing following subnets learn from EIGRPv6 to OSPFv3, but we don’t want to advertise individual prefixes to OSPF domain So we will summarize these prefixes on ABSR i.e. Company X is running EIGRPv6 in their organization as routing protocol and Company Y is using OSPFv3. In below example Company X want to share some of their subnets with Company Y. Background:Įxternal route summarization in OSPFv3 is achieved by using “summary-prefix ” command on ASBR. Then backbone area, in turn, floods the link states to the other areas. When you redistribute route in OSPF domain router called ASBR generate Autonomous system external LSAs (Type 5) and flooded toward Area 0, or the backbone area. External route summarization is specific to external routes that are injected into OSPFv3 using route redistribution. In part-I we discussed on OSPFv3 inter-area route summarization in this document we will discuss OSPF external route summarization.
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