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IP Routing
► What does it mean to have fast or autonomous switching “enabled” and “disabled” on the same interface? 在同一个接口上快速或自主切换“启用”和“停用”是什么意思？
► How is the load shared between two parallel lines of equal capacity when these lines are configured for load balancing? 当两个并行线路配置负载平衡时，并行线路之间的负载如何共享？
► What does route summarization mean? 路由汇聚是什么意思？
► When does a Cisco router generate a source quench? 思科路由器什么时候产生來源抑制？
► When does a Cisco router initiate a routing request out its interfaces? 思科路由器什么时候从其接口发起路由请求?
►What is the difference between the ip default−gateway, ip default−network, and ip route 0.0.0.0/0 commands? IP默认路由，IP默认网络和IP路径 0.0.0.0/0命令有什么区别？
► How do I use the ip helper−address command to forward Bootstrap Protocol (BOOTP) frames? 如何使用IP helper-address命令转发Bootstrap协议（BOOTP）帧？
► Would it be possible to configure a router for a 255.255.254.0 Ethernet and a 255.255.252.0 serial subnet? 可以为255.255.254.0以太网和255.255.252.0串行子网设定路由器吗？
► Does IGRP/RIPv1 support variable subnetting? IGRP / RIPv1是否支持可变长度子网划分？
► Can an interface have more than one ip access−group statement in its configuration? 接口在其设置中可以有多个IP Access-group声明吗？
► Can I configure two interfaces in the same subnet (t0 =142.10.46.250/24 and t1 142.10.46.251/24)? 可以在同一子网中设置两个接口（t0 =142.10.46.250/24和t1 = 142.10.46.251/24）吗？
► Is it possible to have duplicate ip addresses for two serial interfaces that belong to the same router? 属于同一路由器的两个串行接口是否可以拥有重复的IP地址？
► Is there a performance advantage when using the IP access list keyword established on an extended ACL? 使用扩展ACL上建立的IP访问列表关键字是否具有性能优势？
► What is Unicast Reverse Path Forwarding (uRPF)? Can a default route 0.0.0.0/0 be used to perform a uRPF check? 什么是单播逆向转发（uRPF）？可以使用默认路由0.0.0.0/0执行uRPF检查吗？
► Who does load−balancing when there are multiple links to a destination,Cisco Express Forwarding (CEF), or the routing protocol? 当多个链路到达目的地时，Cisco Express Forwarding（CEF）还是路由协议进行负载平衡？
► What are the maximum number of secondary IP addesses that can be configured on a router interface? 在路由器接口上, 最多可以配置多少个的辅助IP地址？
► Can a VLAN interface and a tunnel interface have the same IP address? VLAN接口和隧道接口可否具有相同的IP地址？
► What is Virtual Routing and Forwarding (VRF)? 什么是虚拟路由转发（VRF）？
► How do I connect two different ISPs and route different traffic to different ISPs? 如何连接两个不同的ISP并将流量发送到不同的ISP？
► What is the difference between the two methods to create static routes? 创建静态路由的两种方法有什么区别？
► What is the purpose of ports 2228 and 56506? 端口2228和56506的用途是什么？
► How do you limit the number of sessions when a customer accesses the network? 如何限制客户访问网络时的Session数目？
► What does the term threshold and timeout in IP SLA operation mean? IP SLA操作中阈值和超时是什么意思？
► What is Network Descriptor Block (NDB)? 什么是网络描述符块（NDB）？
►What is the difference between point−to−point subinterfaces and multi−point subinterfaces? 点对点子接口和多点子接口之间有什么区别？
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