Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 99.  B.  The command 

show cdp interface will display all of the interfaces CDP is enabled 

on along with their advertisement intervals. The command 

show cdp is incorrect as it will 

only show the timers for CDP. The command 

show interface is incorrect. The command 

show interface cdp is incorrect.

 100.  B.  EtherChannel can aggregate 2 interfaces to 8 interfaces together on a single switch 

when using PAgP. All of the other options are incorrect.

 101.  D.  When EtherChannel bonds interfaces together, they act as a single Ethernet link. 

Therefore, layer 2 and layer 3 see it as a single link. EtherChannel works independently of 

802.1Q and does not block redundant links. EtherChannel can aggregate multiple links, 

but the links must have the same speed. EtherChannel cannot aggregate interfaces across 

multiple stand-alone switches.

 102.  A.  The highest configurable bandwidth is going to be 2 Gb/s. This is because you cannot 

mix speeds and duplex settings. Therefore, 2.6 Gb/s is not possible, but 400 Mb/s is 

possible using four 100 Mb/s FastEthernet ports.

 103.  A.  The Link Aggregation Control Protocol (LACP) is the IEEE standard 802.3ad. 802.1Q 

is an IEEE standard for VLAN trunking. Port Aggregation Protocol (PAgP) is a Cisco 

proprietary protocol used for port aggregation. 802.1X is a security protocol used with 

Ethernet ports.

 104.  B.  LACP is an IEEE standard that is supported by non-Cisco devices to create aggregation 

links and negotiate the configuration. EtherChannel is a proprietary aggregation protocol 

that is also called PAgP. Channel Group is a configuration term used with Cisco for port 

aggregation.

 105.  C.  EtherChannel can aggregate 2 interfaces to 16 interfaces together on a single switch 

when using LACP. Only eight ports can be used at any one time; the others are placed in 

standby mode. All of the other options are incorrect.

 106.  C.  If you configure the EtherChannel to on mode, it forces the aggregation of links 

without the use of a control protocol. All of the other options are incorrect configurations.

 107.  A.  The term EtherChannel is a Cisco-centric term. Most vendors will not recognize the 

term. PAgP is a Cisco proprietary protocol used for port aggregation. LACP is an open 

standard for port aggregation. PAgP and LACP cannot bundle links with varying speeds 

and duplexes together.

 108.  C.  Port Aggregation Protocol (PAgP) is a Cisco proprietary control negotiation protocol. 

LACP is an open standard for port aggregation. 802.1Q is an IEEE standard for VLAN 

trunking. 802.1ab is an IEEE standard that defines LLDP.