简述OSPF OE1和OE2的区别。

Which two of these statements correctly describe classic PIM-SM？（）

A. The IOS default is for a last-hop router to trigger a switch to the shortest path tree as soon as a new source is detected on the shared tree.
B. The IOS default is for every one of the routers on the shared tree to trigger a switch to the shortest path tree as soon as a new source is detected on the shared tree.
C. The default behavior of switching to the shortest path tree as soon as a new source is detected on the shared tree can be disabled by setting the value in the ip pim spt-threshold command to "infinity."
D. The default behavior of switching to the shortest path tree as soon as a new source is detected on the shared tree can be disabled by setting the value in the ip pim spt-threshold command to "zero.&quot

ip bandwidth-percent eigrp 200 20是什么意思？

The EtherChannel between your LAN switch and the Internet router is not load-balancing efficiently. On the switch， there are several workstations with valid IP ranges. Which load-balance algorithms can you use in the switch in order to optimize this load balancing？（）

A. source IP address
B. destination IP address
C. per-packet load balance
D. destination MAC address
E. source MAC addre

什么是原子聚合？

Which three of these statements about penultimate hop popping are true？（）

A. It is used only for directly connected subnets or aggregate routes.
B. It can only be used with LD
C. It is only used when two or more labels are stacked.
D. It enables the Edge LSR to request a label pop operation from its upstream neighbors.
E. It is requested through TDP using a special label value that is also called the implicit-null value.
F. It is requested through LDP using a special label value that is also called the implicit-null value.

考官用几句话来描述一个过程问这是一个什么过程？ 这几句话中会涉及到：使用TCP 179端口建立连接，使用Keeplive保持邻居状态，可以使用peer-group 简化配置，最终形成的邻居关系是Established状态。

The network administrator is trying to add Switch1 to the network， but the 802.1Q trunk is not coming up. Switch1 was previously tested in the laboratory and its trunk configuration worked fine. What are three possible causes of this problem？（）

A. The trunking configuration mode on Switch1 is set to Off.
B. The trunking configuration mode on the other end is set to On.
C. The trunking configuration mode on the other end is set to Desirable.
D. Cisco Discovery Protocol is not running on the other end.
E. There is a VTP domain name mismatch.
F. Switch1 does not support 802.1

An expanding company is deploying leased lines between its main site and two remote sites. The bandwidth of the leased lines is 128kb/s each，terminated on different serial interfaces on the main router. These links are used for combined VOIP and data traffic. The network administrator has implemented a VOIP solution to reduce costs，and has therefore reserved sufficient bandwidth in a low latency queue on each interface for the VOIP traffic. Users now complain about bad voice quality although no drops are observed in the low latency queue. What action will likely fix this problem？（）

A. mark VOIP traffic with IP precedence 6 and configure only ’fair-queue’ on the links
B. configure the scheduler allocate 3000 1000 command to allow the QoS code to have enough CPU cycles
C. enable class-based traffic shaping on the VoIP traffic class
D. enable Layer 2 fragmentation and interleaving on the links
E. enable Frame Relay on the links and send voice and data on different Frame Relay PVC

Which three of these statements about Dynamic Trunking Protocol are correct？（）

A. It supports autonegotiation for both ISL and IEEE 802.1Q trunks.
B. It must be disabled on an interface if you do not want the interface to work as a trunk or start negotiation to become a trunk.
C. It is a point-to-multipoint protocol.
D. It is a point-to-point protocol.
E. It is not supported on private VLAN ports or tunneling ports.