多选题For what two purposes does the Ethernet protocol use physical addresses？（）Ato uniquely identify devices at Layer 2Bto allow communication with devices on a different networkCto differentiate a Layer 2 frame from a Layer 3 packetDto establish a priority

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多选题

For what two purposes does the Ethernet protocol use physical addresses？（）

to uniquely identify devices at Layer 2

to allow communication with devices on a different network

to differentiate a Layer 2 frame from a Layer 3 packet

to establish a priority system to determine which device gets to transmit first

to allow communication between different devices on the same network

to allow detection of a remote device when its physical address is unknown

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相似问题和答案

第1题：

RIP version 2 is being used as the routing protocol within the Testking network.What does RIP version 2 use to prevent routing loops?（）

A、CIDR
B、Split horizon
C、Authentication
D、Classless masking
E、Hold-down timers
F、Multicast routing updates
G、Path Vectoring

正确答案:B,E

第2题：

Two Cisco routers are connected to each other and are enabled CDP. Serial line is up，protocol is also up but cdp neighbor not working. What layer of the OSI model does the problem most likely exist？

正确答案:Data link layer.

第3题：

Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true? (Select two answer choices)

A. The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.

B. The DHCP Discover message uses UDP as the transport layer protocol.

C. The DHCP Discover message uses a special Layer 2 multicast address as the destination address.

D. The DHCP Discover message uses TCP as the transport layer protocol.

E. The DHCP Discover message does not use a Layer 2 destination address.

F. The DHCP Discover message does not require a transport layer protocol.

正确答案：AB
A,B 解析：Explanation:
DHCP uses UDP as its transport protocol. DHCP messages from a client to a server are sent to the DHCP server port (UDP port 67), and DHCP messages from a server to a client are sent to the DHCP client port (UDP port 68).The client broadcasts a DHCPDISCOVER message on its local physical subnet. The DHCPDISCOVER message may include options that suggest values for the network address and lease duration. BOOTP relay agents may pass the message on to DHCP servers not on the same physical subnet.

Each server may respond with a DHCPOFFER message that includes an available network address in the "ipaddr" field (and other configuration parameters in DHCP options). Servers need not reserve the offered network address, although the protocol will work more efficiently if the server avoids allocating the offered network address to another client. The server unicasts the DHCPOFFER message to the client (using the DHCP/BOOTP relay agent if necessary) if possible, or may broadcast the message to a broadcast address (preferably 255.255.255.255) on the client's subnet.

Incorrect Answers:
C. DHCP messages are broadcast to the "all hosts" address. IP multicast addresses are not used.

D. UDP is used, not TCP.

E. Since DHCP is used so that a client can obtain an IP address, a layer two destination address must be used, as the layer 3 IP address does not yet exist on the client for the return traffic.

F. DHCP, along with nearly every other type of traffic, requires the use of a transport layer protocol.

第4题：

Which two design recommendations are most appropriate when OSPF is the data center core routing protocol？（）

A、 Never use passive interfaces.
B、 Use NSSA areas from the core down.
C、 Use totally stub areas to stop type 3 LSAs.
D、 Use the lowest Ethernet interface IP address as the router ID.
E、 Tune OSPF timers to enable OSPF to achieve quicker convergence

正确答案:B,E

第5题：

What protocol enables Ethernet over SONET/SDH encapsulation interoperability between the G-series and ML-series Ethernet cards？（）

A、 LEX
B、 HDLC
C、 GFP-F
D、 PPP/BCP

正确答案:A

第6题：

For what two purposes does the Ethernet protocol use physical addresses? （）

A、Network A - 172.16.3.48/26
B、Network A - 172.16.3.128/25
C、Network A - 172.16.3.192/26
D、Link A - 172.16.3.0/30
E、Link A - 172.16.3.40/30
F、Link A - 172.16.3.112/30

正确答案:A,E

第7题：

What are two commands that can be used to configure MBGP for multicast？（）

A、Under the BGP group， configure family inet any
B、Use the set protocol MBGP command to enable MBGP
C、Under the BGP group， configure family inet multicast
D、Use the set rib-group command to copy the multicast routes into inet.1

正确答案:A,C

第8题：

When multiple PPP over Ethernet subscribers connect using the same DSL modem, which two attributes does the ERX use to differentiate between subscribers? ()(Choose two.)

A. PPP session ID

B. subscriber name

C. source MAC address

D. destination MAC address

参考答案：A, C

第9题：

Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true?（）

A、The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.
B、The DHCP Discover message uses UDP as the transport layer protocol.
C、The DHCP Discover message uses a special Layer 2 multicast address as the destination address.
D、The DHCP Discover message uses TCP as the transport layer protocol.
E、The DHCP Discover message does not use a Layer 2 destination address.
F、The DHCP Discover message does not require a transport layer protocol.

正确答案:A,B

第10题：

In what two ways does the Cisco SR 520 Secure Router complement the Cisco Smart Business Communications System？（）

A、 stateful packet inspection firewall
B、 10-Gigabit Ethernet connectivity
C、 remote configuration of access points
D、 guest access
E、 Cisco Intrusion Prevention System

正确答案:D,E

For what two purposes does the Ethernet protocol use physica

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