单选题Routers A and B are connected with a point-to-point OC-3 interface. Each router's OC-3 interface is configured for both Level 1 and Level 2. The routers are configured in the same area. How many IS-IS adjacencies exist between the two routers?（）A 0B 1C

第1题：

第2题：

第3题：

第4题：

The PassGuide network consists of a series of routers that are all configured for IBGP. Which one of the following IBGP characteristics is true（）

• A、The IBGP routers must always be fully meshed.
• B、The IBGP routers can be in a different AS.
• C、The IBGP routers must be directly connected.
• D、TThe IBGP routers do not need to be directly connected.
• E、None of the other alternatives apply are true

第5题：

The core of a network has four routers connected in a square design with Gigabit Ethernet links using /30 subnets. The network is used to carry voice traffic and other applications. Convergence time is taking more than expected. Which three actions would you take to improve OSPF convergence time？（）

• A、Increase MTU of the interfaces to accommodate larger OSPF packets.
• B、Change the network type to point-to-point on those links.
• C、Reduce SPF initial timer.
• D、Increase hello interval to avoid adjacency flapping.
• E、Enable OSPF

第6题：

第7题：

Two Cisco routers are connected to each other and are enabled CDP. Serial line is up，protocol is also up but cdp neighbor not working. What layer of the OSI model does the problem most likely exist？

第8题：

第9题：

In which of the following scenarios would the "show cdp neighbors detail"command be an appropriate troubleshooting tool?（）

• A、Two switches are connected via a trunk. Both switches have been assigned an IP address, subnet mask, and default gateway. A ping is successful between the two switches. However, VLAN information is not passed from one switch to the other switch.
• B、A router and a switch have been assigned an IP address, a subnet mask, and a default gateway. They are directly connected, but a ping between the two devices fails.
• C、A router connects to another router through a serial interface. Both routers have been assigned an IP address, subnet mask, and default gateway. The routers are running RIP and the networks directly connected to the first router do not pass to the second router. However, a ping from one router to the serial interface of the directly connected neighboring router is successful.
• D、A router connects to another router via a switch. Both routers and the switch have been assigned an IP address, subnet mask, and default gateway. Neither the routers nor the switch are able to ping one of the hosts that is directly to the switch.

第10题：

Which of the following offers the highest level of redundancy in the design of a storage system？（）

• A、 A Dual Port HBA with a pair of Point-To-Point connections to the SAN.
• B、 Two Single Port HBAs connected to a fiber switch.
• C、 A Dual Port HBA with a Point-To-Point connection to a SAN.
• D、 Two Dual Port HBAs connected to a pair of fiber switches.