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多項(xiàng)選擇題What are two advantages of Layer 2 Ethernet switches over hubs？（）

A.decreasing the number of collision domains
B.filtering frames based on MAC addresses
C.allowing simultaneous frame transmissions
D.increasing the size of broadcast domains
E.increasing the maximum length of UTP cabling between devices

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1.單項(xiàng)選擇題A network engineer wants to allow a temporary entry for a remote user with a specific usename and password so that the user can access the entire network over the internet.which ACL can be used?（）

A.reflexive
B.extended
C.standard
D.dynamic

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2.多項(xiàng)選擇題What can be done to secure the virtual terminal interfaces on a router？（）

A.Administratively shut down the interface.
B.Physically secure the interface.
C.Create an access list and apply it to the virtual terminal interfaces with the access-group command.
D.Configure a virtual terminal password and login process.
E.Enter an access list and apply it to the virtual terminal interfaces using the access-class command.

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3.多項(xiàng)選擇題Which two statements apply to dynamic access lists?（）

A.they offer simpler management in large internetworks.
B.you can control logging messages.
C.they allow packets to be filtered based on upper-layer session information.
D.you can set a time-based security policy.
E.they provide a level of security against spoofing.
F.they are used to authenticate individual users.

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4.多項(xiàng)選擇題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.

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5.單項(xiàng)選擇題Which term describes a spanning-tree network that has all switch ports in either the blocking or forwarding state?（）

A.redundant
B.spanned
C.provisioned
D.converged

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