Transcript 例外(exception）とは何か

Exercise 10
1. 100 byte data is sent using IP across an Ethernet. Before sent, the data will be first
formed an IP datagram and then the datagram will be encapsulated into an Ethernet
Frame. Calculate the percentage of headers in sending the 100 byte data. Assume
no optional field in IP header.
2. Suppose a file of 20 Kbytes to be sent from host H1 to host H2 across three networks as
shown in the following figure. How many IP datagrams will be sent from H1? And how many
IP datagrams will be received by H2? Assume no datagram loss, duplication and disorder
during the transmissions.
H1
Toking Ring
MTU=4464
R1
Ethernet
MTU=1500
R2
FDDI
MTU=4352
H2
3. Host A sends a message to host B and never receive reply from B. However, host A receives
an ICMP message with a header in hexadecimal format as the follows
03 01 1A C8 31 00 B7
Give possible reasons that A does not receive reply from B.
4. Explain how traceroute utility works. Use the utility in a Windows OS environment to probe
the Internet organization web server. The command is tracert www.ietf.org . How many routes
have been passed when your packet travel to the web server? Which one is the slowest?
5. Summarize main features of IPv6 as compared with IPv4.