Tài liệu, ebook Công Nghệ Thông Tin

Which two conditions should the network administrator verify before attempting to upgrade a Cisco IOS image using a TFTP server? –Verify connectivity between the router and TFTP server using the ping command. –Verify that there is enough flash memory for the new Cisco IOS image using the show flash command.

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Link Quality Monitoring (LQM) is available on all serial interfaces running PPP. LQM will monitor the link quality, and if the quality drops below a configured percentage, the router shuts down the link. • The percentages are calculated for both the incoming and outgoing directions. – The outgoing quality is calculated by comparing the total n...

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In addition, to help in the decision-making process, here are some questions to ask yourself when choosing a WAN connection option. • What is the purpose of the WAN? • What is the geographic scope? • What are the traffic requirements? • Should the WAN use a private or public infrastructure? • For a private WAN, should it be dedicated or swit...

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Ensure that access points are not mounted closer than 7.9 inches (20 cm) from the body of all persons. • Do not mount the access point within 3 feet (91.4 cm) of metal obstructions. • Install the access point away from microwave ovens. Microwave ovens operate on the same frequency as the access point and can cause signal interference. • Alwa...

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Each VLAN is a unique broadcast domain, so computers on separate VLANs are, by default, not able to communicate. • Focus on one type of inter-VLAN routing using a separate router connected to the switch infrastructure

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What is Layer 3 Switch? • Layer 3 switching means routing approximately at the speed of switching. A router performs two main functions: – It builds a forwarding table. The router generally exchanges information with peers by way of routing protocols. – It receives packets and forwards them to the correct interface based on the destination ad...

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Configure trunk links • Switch SERVER: – (config)# vtp version {1 |2} – (config)# vtp domain {name} – (config)# vtp password {password} – (config)#vtp mode server

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Remove VLANs from the current list of the trunking line: (config-if)# switchport trunk allowed vlan remove vlan-id • If a VLAN other than VLAN 1 is to be the Native VLAN, it needs to be identified on the trunk ports: (config-if)# switchport trunk native vlan vlan-id

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Interface f0/1 • Switchport mode access • Switchport port-security • Switchport port-security maximum 2 • Switchport port-security mac-address sticky • switchport port-security violation {restrict| protect | shutdown} • Show port-security interface f0/1 • Show port-security address

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A rack unit or U (less commonly RU) is a unit of measure used to describe the height of equipment intended for mounting in a 19-inch rack or a 23-inch rack. One rack unit is 1.75 inches (44.45 mm) high. • The size of a piece of rack-mounted equipment is frequently described as a number in "U". For example, one rack unit is often referred ...

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