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

Keep patches up to date by installing them weekly or daily, if possible, to prevent buffer overflow and privilege escalation attacks. 2. Shut down unnecessary services and ports. 3. Use strong passwords and change them often 4. Control physical access to systems. 5. Mitigating Network Attacks Avoid unnecessary web page inputs. 6. Perform ba...

75 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1201 | Lượt tải: 0

The difficulty in troubleshooting Layer 2 technologies, such as PPP and Frame Relay, is the unavailability of common Layer 3 troubleshooting tools, such as ping, to assist with anything but the identification that the network is down. • Most of the problems that occur with PPP involve link negotiation.

73 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1136 | Lượt tải: 0

access-list 1 permit 10.0.0.0 0.0.0.255 • ip nat pool POOL200 200.0.0.3 200.0.0.6 netmask 255.255.255.248 • ip nat inside source list 1 pool POOL200 overload • Int f0/1 • Ip nat inside • Int s0/0/0 • Ip nat outside

107 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1181 | Lượt tải: 0

Components required to establish this VPN include: 1. An existing network with servers and workstations 2. A connection to the Internet 3. VPN gateways, such as routers, firewalls, VPN concentrators, and ASAs, that act as endpoints to establish, manage, and control VPN connections 4. Appropriate software to create and manage VPN tunnels

54 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1133 | Lượt tải: 0

Deny the DNS requests from the net1, net2 • Permit all other traffics • Access-list 111 deny udp any any eq 53 • Access-list 111 permit ip any any

86 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1133 | Lượt tải: 0

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.

157 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1122 | Lượt tải: 0

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...

95 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1142 | Lượt tải: 0

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...

62 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1240 | Lượt tải: 0

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...

97 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1147 | Lượt tải: 0

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

42 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1224 | Lượt tải: 0