When the source host pings the destination device, if the network works normally, the destination device will respond to the source host with an ICMP_____ packet after receiving the message.

• A.Echo Request
• B.Port-Unreachable
• C.TTL-Exceeded
• D.Echo Reply

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In the Open System Interconnection Reference Model (OSI), ______ transmits data streams in the form of frames.

• A.Transport layer
• B.Data link layer
• C.Session layer
• D.Network layer

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The customer's network connection looks like:
HostA----GE0/0--MSR-1--S1/0-----WAN-----S1/0--MSR-2--GE0/0----HostB
Both routers are factory default configuration.
The four interfaces of the router are configured with correct IP addresses. The two hosts HostA and HostB are configured with IP addresses and gateways. Assuming that all physical connections are normal, then ______. (Multiple choice)

• A.At least one static route needs to be configured on each router to realize the intercommunication between HostA and HostB
• B.No route is configured on the router, HostA can ping the IP address of interface S1/0 of MSR-1
• C.No route is configured on the router, HostA can ping the IP address of interface S1/0 of MSR-2
• D.At least 2 static routes need to be configured on each router to realize the intercommunication between HostA and HostB

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The following statement about the functions of each layer of the OSI reference model is wrong.

• A.The application layer is responsible for providing network services for applications.
• B.The session layer is responsible for data format processing, data encryption, etc.
• C.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.
• D.The basic function of the transport layer is to establish and maintain virtual circuits, perform error checking and flow control.
• E.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.

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A network environment looks like:
HostA----GE0/0--MSR-1--S1/0-----Frame Relay----S1/0--MSR-2--GE0/0----HostB
Among them, two routers MSR-1 and MSR-2 connect to the frame relay network through S1/0 respectively. Configure IP addresses 3.3.3.1/24 and DLCI 31 on the S1/0 interface of MSR-1, and configure IP addresses 3.3.3.2/24 and DLCI 82 on the S1/0 interface of MSR-2. The physical connection is completely normal, and the other default configurations are the same.
So which of the following statements are wrong? (multiple choice)

• A.On a frame relay network, the corresponding relationship between DLCI 31 connected to MSR-1 and DLCI 82 connected to MSR-2 must be correctly configured, so that the S1/0 interfaces of the two routers can communicate with each other.
• B.After configuring the command ip address negotiate on the S1/0 interface of MSR-1, it can dynamically obtain the address from MSR-2.
• C.In the frame relay network exchange process, the source DLCI is always 31, and the destination DLCI will change. Until the last hop, the destination DLCI becomes 82.
• D.On a frame relay network, DLCI 31 can identify MSR-1, and DLCI 82 can identify MSR-2.

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