Thư viện tài liệu, ebook tổng hợp lớn nhất Việt Nam

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 Remove any unnecessary configuration commands that are no longer necessary or have been replaced by other commands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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Which two scenarios would require an administrator to alter the static routes that are configured on that router? – The destination network no longer exists. – A topology change occurs where the existing next-hop address or exit interface is not accessible

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Router# show ip interface brief show ip interface show interface show flash: show ip route dir nvram: show arp Router# ping {destination IP Address} traceroute {destination IP Address} telnet {IP address} show cdp neighbors [detail]

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Some of the different categories for hosts are: –General users –Special users –Network resources –Router LAN interfaces –Router WAN links –Management access
In addition, remember to document your IP addressing scheme on paper. This will be an important aid in troubleshooting and evolving the network

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Which two features make switches preferable to hubs in Ethernet-based networks? –minimizing of collisions –increase in the throughput of communications

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What statements are true regarding addresses found at each layer of the OSI model? –Layer 2 may identify devices by a physical address burned into the network card –Layer 3 represents a hierarchical addressing scheme

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