For such an address, 192.168.19.255/20, the following statements is correct:

• A.segment address 192.168.19.0
  Address in the 192.168.16.0 network segment E.
• B.This is a broadcast address
• C.This is a network address
• D.This is a private address
• E.This is a public address

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The network shown in the figure below, the MAC address of the switch has been marked Enter the command sip root secondary on the SW0 switch. Which of the following switches become the root bridge of this network.

• A.SW0
• B.13 SWB
• C.SWC
• D.SWA

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217.#
Interface GigabitEthernet0/0/1
Port link type trunk
Port trunk allow pass vlan 2 to 4094
#
According to the command output shown above, the correct one in the following description is () (multiple choice)

• A.GigabitEthernet0/0/1 does not allow VLAN1 to pass.
• B.GigabitEthernet0/0/1 allows VLAN1 to pass
• C.If you want to change the GigabitEthernet0/0/1 port to an Access port, you must first use the command
  "undo port trunk allow pass vlan
  2 to 4094" clear default configuration
• D.If you want to change the GigabitEthernet0/0/1 port to an Access port, you must first use the command
  "undo port trunk allow pass vlan
  All clear the default configuration

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The following statement about the working mode of the Ethernet port is correct? (multiple choice)

• A.Gigabit Ethernet can only work in full-duplex mode
• B.100M Ethernet port working mode supports full duplex and half duplex
• C.10 Gigabit Ethernet can only work in full duplex mode
• D.The Ethernet port mode works normally when it does not match.
• E.Ethernet port mode can be considered as defined

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Referring to the following topology and configuration, routers R1 and R2 are connected through a Serial low-speed cable, and the data link layer uses PPP. When R1 and R2 When the Holdtimes are inconsistent, ARP negotiation fails and communication cannot be performed.

• A.Correct
• B.Error

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