During data access, when accessing different network segments, the destination MAC.
Encapsulate the MAC address of the gateway on the source host

A.

True

B.

False

If the value of the ypeLength field of an Ethernet data frame is 0x0800, the length of the
upper layer message header carried by this data frame is in the range of 20-60B. ()

A.

True

B.

False

At what percentage does the DHCP client send the lease renewal message for the first time? ()

A.

0.5

B.

0.875

C.

1

D.

0.25

The following statement about Python is incorrect ()

A.

Is a fully open source high-level programming language

B.

Has a rich third-party library

C.

Have a clear grammatical structure, easy to learn, and high efficiency for colleagues

D.

Can be used for automated operation and maintenance scripts, artificial intelligence
data science and many other fields

The correct statement about the transport layer protocol is ()

A.

UDP is suitable for the transmission of delay-sensitive traffic, and can be reorganized
according to the sequence number field in the message header

B.

Well-known port number range is 0-1023

C.

UDP uses the STNOACK flag to request and confirm the establishment of a connection

D.

The establishment of a TCP connection is a three-way handshake, and the termination
of a TCP connection requires a four-way handshake.

The management of users by NAS devices is based on domains. Each user belongs to a
domain, and a domain is a group composed of users belonging to the same domain. ()

A.

True

B.

False

The configuration information of a certain port of the switch is shown in the figure. Which of the following statements is wrong? ()
interface GigabitEthernet0/0/1 port link type trunk port trunk pviD.vlan 200 port trunk allowpass
vlan100#

A.

If the VLAN TAG carried in the data frame is 100, the switch will strip off the VLAN TAG and send it out

B.

This port cannot send data frames carrying VLAN TAG200

C.

The port type is Trunk type

D.

If the port receives a data frame without VLAN TAG, the switch needs to add VLAN TAG
200

The election of the root switch in STP only compares the priority of the switch, while in
RSTP, the priority of the switch and the MAC address are compared at the same time. ()

A.

True

B.

False

If the largest number in an ACL rule is 12, by default, the user does not specify a number
when configuring a new rule, then the number assigned to the new rule by the system is? ()

A.

15

B.

14

C.

16

748.192.168.1.127/25 represents the () address. ()

A.

broadcast

B.

The internet

C.

Host

D.

Multicast