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[主观题]

Packets on PTN devices are classified based on ().

A. Standard ACL, only matching source IP address

B.Extended ACL, matching source IP address, IP protocol type, TCP source port No., TCP destination port No., UDP source port No., UDP destination port No., ICMP type, ICMP Code, DSCP (DiffServ Code Point), ToS and Precedence.

C.L2 ACL, matching source MAC address, destination MAC address, source VLAN ID, L2 Ethernet protocol type, and 802.1p preference value.

D.Mixed ACL, matching source MAC address, destination MAC address, source VLAN ID, source IP address, destination IP address, TCP source port No., TCP destination port No., UDP source port No., and UDP destination port No.

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发布时间：2022-07-06

更多“Packets on PTN devices are classified based on ().”相关的问题

第1题

Two PTN equipments have been enabled with time synchronization, with BMC algorithm; an

A.1588 synchronization packets form. a loop

B.frequency between equipments fails to synchronize

C.BMC notification packets between NEs form. a loop

D.Equipment 1588 module is damaged

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第2题

During field tests of PTN device, eth ports of the device will actively send out clust

er management protocol packets. Transmission of this type of packets can be stopped by delivering()command in corresponding port.

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第3题

Devic病的脱髓鞘病变特点是

A.主要累及视神经和脊髓

B.主要累及脑室周围白质

C.主要累及脑干白质

D.病变呈同心圆分布

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第4题

Compared with OAM packets based on G.8114, OAM packets based on Y.1731 has changed lab

el value from ()to().

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第5题

()a kind of frequency sync technique, encloses clock frequency in special()packets and

（)a kind of frequency sync technique, encloses clock frequency in special（)packets and

strip it off if necessary to implement transparent transmission of clock frequency on PSN.

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第6题

UNI ports configured to TRUNK mode on ZXCTN equipment can forward packets with or wit

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第7题

For packets larger than 1642 bytes to pass UNI port, enable()function of the port on

For packets larger than 1642 bytes to pass UNI port, enable（)function of the port on

ZXCTN equipment.

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第8题

QoS packet classification refers to dividing packets into multiple priorities or types

of service. For example, by first three bits (priority subfield) of TOS field (Type of service) in IP packet header, packets can be classified into at most()types.

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第9题

By default, max. packet length supported by interfaces is 1668 bytes. When traffic flo

ws from service access side of PE device to network side, new Ethernet header and two TMPLS labels need to be added for service packets, which may increase the packet length by()bytes. When UNI side receives packets with length over 1642 bytes, packets will be dropped due to the addition of header at NNI side, affecting service performance. Therefore, jumbo frame. forwarding function on all service related interfaces should be enabled.

A.20

B.24

C.26

D.30

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第10题

When creating end-to-end TMPLS tunnel on T31 EMS, which of the following functions doe

s next-hop info of the tunnel provide？ ()

A.Configure service encapsulation VLAN ID of the tunnel

B.Search ARP table for MAC according to next-hop IP and then encapsulate packets with the found destination MAC

C.Perform. end-to-end routing calculation according to IP of next-hop info

D.The equipment finds egress port of the tunnel directly according to IP of next-hop info