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1.
Cisco EVN uses what type of trunk to carry traffic for all virtual networks between two physical routers?
  • A.
    VNET
  • B.
    ISL
  • C.
    dot1Q
  • D.
    802.10
  • Answer & Explanation
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Answer : [A]
Explanation :
Cisco Easy Virtual Network (EVN) uses a Virtual Network Trunk (VNET Trunk) to carry traffic for each virtual network, and eliminates the need to manually configure a subinterface for each virtual network on all routers.
Inter-Switch Link (ISL) is a Cisco-proprietary trunking technology for Ethernet networks.
IEEE 802.1Q is an industry-standard trunking technology for Ethernet networks.
IEEE 802.10 is an industry-standard trunking technology for FDDI networks.
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2.
When migrating from a PVST+ to Rapid-PVST+, which PVST+ features can be disabled, because similar features are built into Rapid-PVST+? (Choose the two best answers.)
  • A.
    UplinkFast
  • B.
    Loop Guard
  • C.
    BackboneFast
  • D.
    PortFast
  • Answer & Explanation
  • Report
Answer : [A],[C]
Explanation :
When converting a Cisco Catalyst switch to Rapid-PVST+, you can remove the UplinkFast and BackboneFast features, because similar features are built into Rapid-PVST+. However, the following features can still be used with Rapid-PVST+: PortFast, BPDU Guard, BPDU Filter, Root Guard, and Loop Guard.
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3.
A network segment has a bandwidth of 10 Mbps, and packets experience an endto- end latency of 100 ms. What is the bandwidth-delay product of the network segment?
  • A.
    100,000,000 bits
  • B.
    10,000,000 bits
  • C.
    1,000,000 bits
  • D.
    100,000 bits
  • Answer & Explanation
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Answer : [C]
Explanation :
The bandwidth-delay product of a segment is the measure of the maximum number of bits that can be on the segment at any one time. The bandwidth-delay product is calculated by multiplying the segment’s bandwidth (in bits/sec) by the latency that packets experience as they cross the segment (in sec).
In this question, the bandwidth-delay product can be calculated as follows:
bandwidth-delay product = 10,000,000 bits/sec * 0.1 sec = 1,000,000 bits.
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4.
Which of the following best defines TCP MSS?
  • A.
    The total data in a TCP segment, including only the TCP header
  • B.
    The total data in a TCP segment, not including any headers
  • C.
    The total data in a TCP segment, not including any headers
  • D.
    The total data in a TCP segment, including the Layer 2, IP, and TCP headers
  • Answer & Explanation
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Answer : [B]
Explanation :
The term TCP Maximum Segment Size (MSS) seems to imply the size of the entire Layer 4 segment (that is, including Layer 2, Layer 3, and Layer 4 headers). However, TCP MSS only refers to the amount of data in the segment (without the inclusion of any headers).
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5.
An NBMA network has which of the following design issues? (Choose the two best answers.)
  • A.
    Split Horizon issues
  • B.
    Bandwidth issues
  • C.
    Quality of service issues
  • D.
    Designated router issues
  • Answer & Explanation
  • Report
Answer : [A],[D]
Explanation :
A nonbroadcast multiaccess (NBMA) network can have Split Horizon issues in a hub-and-spoke topology, because a route learned by the hub router from a spoke router might not be advertised back out to any other spoke routers, because of Split Horizon operation. Also, if the NBMA network is using OSPF, there can be designated router issues, because the spoke routers might not be able to communicate with one another through broadcasts.
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