10. Detailed Protocol Support (RFC1122 excerpt)
10.1. Ethernet Layer
| Feature | Section | Must | Must Not | Implemented |
| Send Trailers by default without negotiation | 2.3.1 | x | x | |
| ARP | 2.3.2 | |||
| Flush out-of-date ARP cache entries | 2.3.2.1 | x | (x) | |
| Prevent ARP floods | 2.3.2.1 | x | (x) | |
| Ethernet and IEEE 802 Encapsulation | 2.3.3 | |||
| Host able to: | 2.3.3 | |||
| Send & receive RFC-894 encapsulation | 2.3.3 | x | x | |
| Send K1=6 encapsulation | 2.3.3 | x | ||
| Use ARP on Ethernet and IEEE 802 nets | 2.3.3 | x | x | |
| Link layer report b’casts to IPv4 layer | 2.4 | x | ||
| IPv4 layer pass TOS to link layer | 2.4 | x | ||
| No ARP cache entry treated as Dest. Unreach. |
2.4 | x | x |
10.2. IPv4 & ICMP Layer
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