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单选题
What is a characteristic of ISL and 802.1q frame tagging in a switched LAN environment?（）
A
They are used to find the best path through a network.
B
They allow the exchange of filtering tables.
C
They specify different implementations of the Spanning-Tree Protocol.
D
They allow the exchange of routing tables
E
They provide inter-switch VLAN communication.
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Which statement is correct about logical units on Juniper Router interfaces?()
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VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link .How does ERS use the VLAN tag?（）A. provide service internetworkingB. support transparency for Layer 2 framesC. indicate destination as a connection identifierD. map to the DLCI in service internetworking
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When configuring VLANs on an autonomous access point，what must be configured on theconnected switchport？（）A、802.1q trunkingB、VTP trunkingC、ISL trunkingD、DPT trunking
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When configuring vlans on an autonomous access point. What must be configured on the connected switchport？（）A、802.1q trunkingB、vtp trunkingC、isl trunkingD、dpt trunking
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What is a characteristic of ISL and 802.1q frame tagging in a switched LAN environment?（）A、They are used to find the best path through a network.B、They allow the exchange of filtering tables.C、They specify different implementations of the Spanning-Tree Protocol.D、They allow the exchange of routing tablesE、They provide inter-switch VLAN communication.
考题
ISL is being configured on a Company switch. Which of the following choices are true regarding the ISL protocol？ （）A、 It can be used between Cisco and non-Cisco switch devices.B、 It calculates a new CRC field on top of the existing CRC field.C、 It adds 4 bytes of protocol-specific information to the original Ethernet frame.D、 It adds 30 bytes of protocol-specific information to the original Ethernet frame.
考题
The core Company switches are configured to use 802.1Q trunks. Which three statements are correct with regard to the IEEE 802.1Q standard？（）A、 The IEEE 802.1Q frame format adds a 4 byte field to a Ethernet frameB、 The packet is encapsulated with a 26 byte header and a 4 byte FCSC、 The protocol uses point-to-multipoint connectivityD、 The protocol uses point-to-point connectivityE、 The IEEE 802.1Q frame uses multicast destination of 0x01-00-0c-00-00F、 The IEEE 802.1Q frame retains the original MAC destination address
考题
VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link .How does ERS use the VLAN tag?（）A、provide service internetworkingB、support transparency for Layer 2 framesC、indicate destination as a connection identifierD、map to the DLCI in service internetworking
考题
You are designing your network to be able to use trunks. As part of this process you are comparing the ISL and 802.1Q encapsulation options. All of these statements about the two encapsulation options are correct except which one？（）A、Both support normal and extended VLAN ranges.B、ISL is a Cisco proprietary encapsulation method and 802.1Q is an IEEE standard.C、ISL encapsulates the original frame.D、Both support native VLANs.E、802.1Q does not encapsulate the original frame.
考题
Which two of these are characteristics of the 802.1Q protocol?（）A、it is a layer 2 messaging protocol which maintains vlan configurations across network.B、it includes an 8-bit field which specifies the priority of a frame.C、it is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.D、it modifies the 802.3 frame header,and thus requires that the FCS be recomputed.E、it is a trunking protocol capable of carring untagged frames.
考题
The Company core switches use 802.1Q trunks to connect to each other. How does 802.1Q trunking keep track of multiple VLANs？ （）A、 It tags the data frame with VLAN information and recalculates the CRC valueB、 It encapsulates the data frame with a new header and frame check sequenceC、 It modifies the port index of a data frame to indicate the VLAND、 It adds a new header containing the VLAN ID to the data frameE、 None of the other alternatives apply
考题
Which statement is correct about logical units on Juniper Router interfaces?（）A、Logical units are used only when a Layer 2 identifier is present such as a VLANB、A logical unit of 0 is required when using a frame-relay DLCIC、A logical unit is always requiredD、Logical units are not required unless ATM or 802.1Q VLAN tagging is configured.
考题
多选题The core Company switches are configured to use 802.1Q trunks. Which three statements are correct with regard to the IEEE 802.1Q standard？（）AThe IEEE 802.1Q frame format adds a 4 byte field to a Ethernet frameBThe packet is encapsulated with a 26 byte header and a 4 byte FCSCThe protocol uses point-to-multipoint connectivityDThe protocol uses point-to-point connectivityEThe IEEE 802.1Q frame uses multicast destination of 0x01-00-0c-00-00FThe IEEE 802.1Q frame retains the original MAC destination address
考题
单选题You are designing your network to be able to use trunks. As part of this process you are comparing the ISL and 802.1Q encapsulation options. All of these statements about the two encapsulation options are correct except which one？ （）A
Both support normal and extended VLAN ranges.B
ISL is a Cisco proprietary encapsulation method and 802.1Q is an IEEE standard.C
ISL encapsulates the original frame.D
Both support native VLANs.E
802.1Q does not encapsulate the original frame.
考题
单选题You need to connect two Company core switches via an ISL trunk. Which statement is true regarding the configuration of ISL trunks？ （）A
A Catalyst switch cannot have ISL and IEEE 802.1q trunks enabled.B
All Catalyst switches support ISL trunking.C
A Catalyst switch will report giants if one side is configured for ISL while the other side is not.D
ISL trunking requires that native VLANs match.E
None of the other alternatives apply
考题
多选题Which two of these are recommended practices with trunks？（）Ause ISL encapsulationBuse 802.1q encapsulationCset ISL to desirable and auto with encapsulation negotiate to support ILS protocol negotiationDuse VTP server mode to support dynamic propagation of VLAN information across the networkEset DTP to desirable and desirable with encapsulation negotiate to support DTP protocol negotiation
考题
单选题Which statement is correct about logical units on Juniper Router interfaces?（）A
Logical units are used only when a Layer 2 identifier is present such as a VLANB
A logical unit of 0 is required when using a frame-relay DLCIC
A logical unit is always requiredD
Logical units are not required unless ATM or 802.1Q VLAN tagging is configured.
考题
多选题Which two of these are characteristics of the 802.1Q protocol?（）Ait is a layer 2 messaging protocol which maintains vlan configurations across network.Bit includes an 8-bit field which specifies the priority of a frame.Cit is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.Dit modifies the 802.3 frame header,and thus requires that the FCS be recomputed.Eit is a trunking protocol capable of carring untagged frames.
考题
单选题You are designing your network to be able to use trunks. As part of this process you are comparing the ISL and 802.1Q encapsulation options. All of these statements about the two encapsulation options are correct except which one？（）A
Both support normal and extended VLAN ranges.B
ISL is a Cisco proprietary encapsulation method and 802.1Q is an IEEE standard.C
ISL encapsulates the original frame.D
Both support native VLANs.E
802.1Q does not encapsulate the original frame.
考题
单选题The Company core switches use 802.1Q trunks to connect to each other. How does 802.1Q trunking keep track of multiple VLANs？ （）A
It tags the data frame with VLAN information and recalculates the CRC valueB
It encapsulates the data frame with a new header and frame check sequenceC
It modifies the port index of a data frame to indicate the VLAND
It adds a new header containing the VLAN ID to the data frameE
None of the other alternatives apply
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