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Bước 10: Đối với mật khẩu cho phép có một khuyết điểm đó là mật khẩu này xuất hiện dưới dạng bản rõ (plain text) trong tệp cấu hình của switch, điều này sẽ rất nguy hiểm nếu ai đó xem được tệp tin cấu hình.  Cần tạo mật khẩu được bảo mật, ví dụ tạo mật khẩu là „ciao‟ (config)#enable secret level 15 ciao Mật khẩu bảo mật là một mật khẩu bổ su...

131 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1172 | Lượt tải: 0

The encrypted authentication • Create a plain text password: – Router(config-if)#ip ospf message-digest-key {keyid} md5 {password} • Enable authentication on all interfaces: – Router(config-router)#area {area-number} authentication message-digest • Or • Enable authentication on an interface: – Router(config-if)# ip ospf authentication messa...

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Memory requirements – Typically link state routing protocols use more memory • Processing Requirements – More CPU processing is required of link state routing protocols • Bandwidth Requirements – Initial startup of link state routing protocols can consume lots of bandwidth

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Describe the background and history of EIGRP • Describe the features and operation of EIGRP • Examine the basic EIGRP configuration commands and identity their purposes • Calculate the composite metric used by EIGRP • Describe the concepts and operation of DUAL • Describe the uses of additional configuration commands in EIGRP

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Học viện mạng Bach Khoa - Website: www.bkacad.com 53 • Classful vs. Classless Routing Behavior – It is recommended to use classless routing behavior so supernet and default routes can be used whenever needed – Remember that classful and classless routing behaviors are independent from classful and classless routing protocols. – A router could...

56 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 998 | Lượt tải: 0

It is always best to begin with the basics: 1. Make sure all of the links (interfaces) are up and operational. 2. Check the cabling. 3. Check to make sure you have the correct IP address and subnet mask on each interface. 4. Remove any unnecessary configuration commands that are no longer necessary or have been replaced by other commands

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Company XYZ needs to address 400 hosts. • Its ISP gives them two contiguous Class C addresses: – 207.21.54.0/24 – 207.21.55.0/24 • Company XYZ can use a prefix of 207.21.54.0 /23 to supernet these two contiguous networks. (Yielding 510 hosts) • 207.21.54.0 /23 – 207.21.54.0/24 – 207.21.55.0/24

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RIP characteristics include: – Classful, distance vector routing protocol – Metric is Hop Count – Does not support VLSM or discontiguous subnets – Updates every 30 seconds • Rip messages are encapsulated in a UDP segment with source and destination ports of 520

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Which of the following can exist in a distance vector network that has not converged? –routing loops –inconsistent traffic forwarding –inconsistent routing table entries

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Why is fast convergence desirable in networks that use dynamic routing protocols? • Routers may make incorrect forwarding decisions until the network has converged. 2. What is conditions must be met in order for a network to have converged? • The routers in the network are operating with consistent routing knowledge

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