Which of the following will generate an ICMP message?
A: Unreachable destination
B: The TTL value of a packet reaches zero
C: Echo request
D: All of the choices
A: Unreachable destination
B: The TTL value of a packet reaches zero
C: Echo request
D: All of the choices
举一反三
- 中国大学MOOC: Which of the following will generate an ICMP message?
- When an IP packet is Layer 3-switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? （） A: Layer 2 TTL B: Layer 3 TTL C: Layer 3 source address D: Layer 3 transport protocol E: Layer 3 destination addre
- 一台计算机的IP地址为211.34.114.254，使用标准掩码，未设置网关，Ping211.34.113.3，回应为（） A: Reply？form？211.34.113.3：bytes=32？time=2ms？TTL=255 B: Request？timed？out C: Destination？Host？Unreachable D: Reply？from？211.34.113.3：？Destination
- 若使用Ping命令向目标主机发送ICMP回应请求（ICMP echo request），并且目标主机返回ICMP回应应答（ICMP echo reply），则可判断：
- Doing, Being, and Being-in-becoming are all value orientations that correspond to which of the following questions?