A host computer has been correctly configured with a static IP address, but the default gateway is incorrectly set. Which layer of the OSI model will be first affected by this configuration error?A. Layer 1B. Layer 2C. Layer 3D. Layer 4E. Layer 5F. Layer

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第6题：

When an IP packet is Layer 3-switched from a source in one VLAN to a destination in anotherVLAN, which field in a packet will be rewritten? （）

• A、Layer 2 TTL
• B、Layer 3 TTL
• C、Layer 3 source address
• D、Layer 3 transport protocol
• E、Layer 3 destination address

正确答案:B

第7题：

Which of the following is a characteristic of a data center core?（）

• A、Server-to-server traffic always remains in the core layer.
• B、The recommended practice is for the core infrastructure to be in Layer 3.
• C、The boundary between Layer 2 and Layer 3 should be implemented in the aggregation layer.
• D、The Cisco Express Forwarding hashing algorithm is the default, based on the IP address and Layer 4 port.
• E、Core layer should run BGP along with an IGP becauseiBGP has a lower administrative distance than any IGP.

正确答案:B

第8题：

When an IP packet is Layer 3-switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? （）

• A、Layer 2 TTL
• B、Layer 3 TTL
• C、Layer 3 source address
• D、Layer 3 transport protocol
• E、Layer 3 destination address

正确答案:B

第9题：

At which of the following OSI model layers is HTTPS encryption performed?（）

• A、Layer 3
• B、Layer 5
• C、Layer 6
• D、Layer 7

正确答案:C

第10题：

An administrator issues the command ping 127.0.0.1 from the command line prompt on a PC.If a reply is received, what does this confirm?（）

• A、The PC has connectivity with a local host.
• B、The PC has connectivity with a Layer 3 device.
• C、The PC has a default gateway correctly configured
• D、The PC has connectivity up to Layer 5 of the OSI model
• E、The PC has the TCP/IP protocol stack correctly installed.

正确答案:E

第11题：

At which layer of the OSI model does error checking occur with IPv6?（）

• A、Layer 2
• B、Layer 3
• C、Layer 4
• D、Layer 7

正确答案:C

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第17题：

At which layer of the OSI model dose PPP perform?（）

• A、Layer 3
• B、Layer 4
• C、Layer 2
• D、Layer 5

正确答案:C

第18题：

Assuming that an IP packet is sent from a source address in VLAN1 to a destination address in VLAN2 through a layer-3 switch, which part of the packet will be changed?（）

• A、Layer 2 TTL
• B、Layer 3 TTL
• C、Layer 3 source address
• D、Layer 3 destination address

正确答案:B

第19题：

In the 7-layer OSI model, which layer switching will take place?（）

• A、Layer two
• B、Layer four
• C、Layer one
• D、Layer three

正确答案:A

第20题：

Distribution layer: This layer includes LAN-based routers and layer 3 switches . When is a first-hop redundancy protocol needed in the distribution layer?（）

• A、OSPF is not supported by the design
• B、HSRP is not supported by the design
• C、preempt tuning of the default gateway is needed
• D、the design implements Layer 3 between the access switch and the distribution switch

正确答案:D

第21题：

At which layer of the OSI model does the Spanning Tree Protocol （STP） operate at？（）

• A、Layer 5
• B、Layer 4
• C、Layer 3
• D、Layer 2
• E、Layer 1

正确答案:D

第22题：

An administrator attempts to open a web page and sees the following error: 'Error 404: Page not found'. The administrator then uses the ping command and finds that the default gateway cannot be pinged. At which of the following layers does the problem MOST likely reside?（）

• A、Layer 1
• B、Layer 4
• C、Layer 5
• D、Layer 7

正确答案:A

第23题：