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H3C Constructing Small - and Medium - Sized Enterprise Network Sample Questions:

1. The Ethernet port Ethernet1/0 of the customer router MSR-1 is configured as follows:
interface Ethernet0/0
ip address 192.168.0.1 255.255.255.0
This interface is connected to a three-layer switch, and this three-layer switch is where the default gateway of the network segment 192.168.7.0/24~192.168.83.0/24 of the customer's office network is located.
Now the customer requires that an ACL be configured on the MSR-1 to prohibit all users on the office network from initiating Telnet to the address 192.168.0.1 of the MSR-1, so which of the following configurations is correct?

A) acl number 3000 rule 0 deny 0.0.0.0 255.255.255.255 destination 192.168.0.1 0 destination-port eq telnet interface Ethernet0/0 ip address 192.168.0.1 255.255.255.0 firewall packet-filter 3000 outbound
B) acl number 3000 rule 0 deny 0.0.0.0 255.255.255.255 destination 192.168.0.1 0 destination-port eq telnet interface Ethernet0/0 ip address 192.168.0.1 255.255.255.0 firewall packet-filter 3000 inbound
C) acl number 3000 rule 0 deny 255.255.255.255 0 destination 192.168.0.1 0 destination-port eq telnet interface Ethernet0/0 ip address 192.168.0.1 255.255.255.0 firewall packet-filter 3000 outbound
D) acl number 3000 rule 0 deny 255.255.255.255 0 destination 192.168.0.1 0 destination-port eq telnet interface Ethernet0/0 ip address 192.168.0.1 255.255.255.0 firewall packet-filter 3000 inbound

2. The following statement about the functions of each layer of the OSI reference model is correct. ______. (Multiple choice)

A) The physical layer refers to the original bit stream transmitted on the communication channel (Channel), which defines the mechanical and electrical functions and procedures required for data transmission.
B) The basic function of the transport layer is to establish and maintain virtual circuits, perform error checking and flow control.
C) The session layer is responsible for data format processing, data encryption, etc.
D) The network layer decides the best route for transmitting the message. The key issue is to determine how the data packet is routed from the source to the destination.
E) The application layer is responsible for providing network services for applications.

3. There are two hops from the source device to the destination device. Use the tracert command to detect the path. When detecting the first hop, the source device sends a UDP packet with a TTL of 1 to the middle hop; when detecting the second hop, the source device sends a UDP packet with a TTL of 2, and the packet reaches the middle hop first, and the TTL is decremented When the message reaches the destination, the TTL will be decremented to 0. At this time, the destination device will send an ICMP_____ message to the source to inform the source device that it has tracked the destination address.

A) Echo Reply
B) Echo Request
C) Port Unreachable
D) Time Exceeded

4. The transport layer protocol that DNS can use is ______.

A) TCP or UDP
B) UDP
C) TCP
D) NCP

5. Normally, the router will fragment packets whose length is greater than the interface MTU.
In order to detect the line MTU, you can ping the destination address with the ______ parameter.

A) -f
B) -a
C) -d
D) -c

Solutions: