what is Cisco provides three mechanisms for regulating or shaping traffic？

A router is connected to an HDLC circuit via a T1 physical interface. The SLA for this link only allows for a sustained rate of 768 kb/s. Bursts are allowed for up to 30 seconds at up to line rate，with a window Tc of 125 ms. What should the Bc and Be setting be when using generic traffic shaping？（）

A. Be = 46320000 ，Bc = 96000
Be = 768000 ，Bc = 32000
C. Be = 128000 ，Bc = 7680
D. Be = 0 ，Bc = 96000

BGP Routes with which community will not advertise to any peers？

hy you use Spanning-tree？ Difference between PVST & MST.

what is the difference between the HSRP and VRRP？

问10.1.1.0/24 10.1.2.0/24可以将这两条路由汇总成最短的掩码是什么？

Multi-exit-discriminator、AS-Path、Weight、Local preference在BGP选路中的先后顺序？

You have two EBGP peers connected via two parallel serial lines. What should you do to be able to load-balance between two EBGP speakers over the parallel serial lines in both directions？ （）

A. nothing，BGP automatically load-balances the traffic between different autonomous systems on all available links
B. peer between the eBGP speaker’s loopbacks， configuring eBGP multihop as required， and use an IGP to load-share between the two equal-cost paths between the loopback addresses
C. configure a loopback as update source for both EBGP peers and have on each AS an IGP to introduce two equal-cost paths to reach the EBGP peer loopback address；it is also necessary to use the next-hop-self command
D. use the ebgp-load-balance command on the neighbor statement on both sides
E. configure a loopback as update source for both EBGP peers and have on each AS an IGP to introduce two equal-cost paths to reach the peer loopback address；it is also necessary to use the ebgp-multihop and next-hop-self command

在OSPF网络中建立nssa区域的area 1 nssa default-information-originate中参数default-information-originate是什么意思呢？

问关于QOS的3种机制。