关于网络安全防火墙的外文翻译 200分

2025-02-21 06:47:19

推荐回答（5个）

回答1：

网络防火墙

NETWORK FIREWALLS
The purpose of a network firewall is to provide a shell around the network which will protect the systems connected to the network from various threats. The types of threats a firewall can protect against include:
● Unauthorized access to network resources—an intruder may break into a host on the network and gain unauthorized access to files.
● Denial of service—an individual from outside of the network could, for example, send thousands of mail messages to a host on the net in an attempt to fill available disk space or load the network links.
● Masquerading—electronic mail appearing to have originated from one individual could have been forged by another with the intent to embarrass or cause harm.
A firewall can reduce risks to network systems by filtering out inherently insecure network services. Network File System (NFS) services, for example, could be prevented from being used from outside of a network by blocking all NFS traffic to or from the network. This protects the individual hosts while still allowing the service, which is useful in a LAN environment, on the internal network. One way to avoid the problems associated with network computing would be to completely disconnect an organization’s internal network from any other external system. This, of course, is not the preferred method. Instead what is needed is a way to filter access to the network while still allowing users access to the “outside world”.
In this configuration, the internal network is separated from external networks by a firewall gateway. A gateway is normally used to perform relay services between two networks. In the case of a firewall gateway, it also provides a filtering service which limits the types of information that can be passed to or from hosts located on the internal network. There are three basic techniques used for firewalls: packet filtering, circuit gateway, and application gateways. Often, more than one of these is used to provide the complete firewall service.
There are several configuration schemes of firewall in the practical application of inter-network security. They usually use the following terminologies:
● Screening router—it can be a commercial router or a host—based router with some kind of packet filtering capability.
● Bastion host—it is a system identified by the firewall administrator as a critical strong point in the network security.
● Dual—homed gateway—some firewalls are implemented without a screening router, by placing a system on both the private network and the Internet, and disabling TCP/IP forwarding.
● Screened�host gateway—it is possibly the most common firewall configuration. This is implemented using a screening router and a bastion host.
● Screened subnet—an isolated subnet is situated between the Internet and the private network. Typically, this network is isolated using screening routers, which may implement varying levels of filtering.
● Application—level gateway—it is also called a proxy gateway and usually operates at a user level rather than the lower protocol level common to the other firewall techniques.

回答2：

金山快译

回答3：

留下个邮箱或者qq
我发给你
当然前提是你把分给我

回答4：

Preface.
Acknowledgments
Part I Introducing TCP/IP and the Need for Security: Firewalls
Chapter 1 Internetworking Protocols and Standards: An Overview
Internet Protocol (IP)
User Oatagram Protocol (UDP)
Transmission Control Protocol (TCP)
Extending IP Addresses Through CIDR
Routing Information Protocol (RIP)
MBONE -- The Multicast Backbone
Internet Control Message Protocol (ICMP)
Internet Group Management Protocol (IGMP)
Open Shortest-Path First (OSPF)
Border Gateway Protocol Version 4 (BGP-4)
Address Resolution Protocol
Simple Network Management Protocol (SNMP)
Watch Your ISP Connection
The Internet Protocol Next Generation or IPv6
Network Time Protocol (NTP)
Dynamic Host Configuration Protocol (DHCP)

回答5：

网络防火墙网络防火墙的目的要在将会保护被连接到来自各种不同的威胁网络的系统网络的周围提供一个贝壳. 一个防火墙能保护的威胁类型反对包括:
●未经认可的通路对网络资源—一个侵入者可能闯入对文件的在网络和增益上的一个主人未经认可的通路.
服务—的●否认一个个体从在网络的外面可以，举例来说，在网上寄数以千计邮件信息给一个主人试图填充可得的磁盘片隔开或装载网络联编.
似乎已经从一个个体开始的● Masquerading —电子邮件应该可以被另外一用意图伪造使或困窘引起伤害.
一个防火墙能出自固有地不安全的网络服务让危险变成过滤的网络系统. 网络文件系统 (NFS) 服务, 举例来说, 从被用可能被避免从在一个网络的外面藉由到或从网络阻断所有的 NFS 交通. 当仍然允许服务的时候 , 这保护个别的主人, 是有用的在区域网络环境中,在内在的网络上. 避免被和网络计算联合的问题一个方法会要完全地将组织的内在网络从任何其他的外部系统分离出来. 这,当然, 被的方法不是. 改为什么被需要是过滤对网络的通路一个方法当仍然允许使用者通路到 "在世界的外面"的时候.
在这一个结构中，内在的网络与防火墙出入口的外部网络分离. 出入口正常地用来运行在二个网络之间的继电器服务. 在防火墙出入口的情况，它也提供一个过滤服务极限可能被传给的数据类型或从位于内在的网络之上的主人. 有三基本作为防火墙的技术: 打包过滤，线路出入口和申请出入口. 时常, 超过这些之一用来提供完全的防火墙服务.
有在中间- 网络安全的实际申请的防火墙的一些结构方案. 他们通常使用下列各项用辞:
审查路由器—的●它可能是有储存器过滤能力的一些类型的建立路由器的一个商业的路由器或主人—.
●棱堡主人—它是一个被防火墙管理人识别如网络安全的紧要关头的强烈点系统.
●双重的—回家了一些防火墙不需要一个纱网材料路由器就能被实现的出入口—,藉由放一个系统在两者的私人网络和英特网上, 而且使传输控制协议/ IP 转寄失去能力.
可能地被审查�主人出入口—它的●是最通常的防火墙结构. 这被实现使用一个纱网材料路由器和一个棱堡主人.
●审查了一张隔离的次网在英特网和私人的网络之间被位于的次网—. 典型地，这一个网络被隔离使用纱网材料路由器, 可能实现改变过滤的水平.
●申请—水平出入口—它也被称为代理出入口和通常在一个使用者水平操作并非比较低度的记录通常的对其他防火墙技术.

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关于网络安全 防火墙的外文翻译 200分

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