Chapter 8 (Part 1) TCP/IP Internetworking I
1) Ethernet standards are set at the ________.
physical layer
Decision caching ________.
reduces routing costs
A(n) ________ must find the best-matching row in its ________ table by comparing multiple row matches.
router; routing
In a routing table, a ________ represents a route for a group of IP addresses.
row
The second step in the routing process involves ________.
selecting the best-match row
Which of the following is one of the three parts of an IPv4 address?
subnet part
An internal router connects different IP ________.
subnets
For cost reasons, you should ________ where you can, ________ where you must.
switch; route
TCP/IP standards are set at the ________.
transport layer
In decision cashing, when 20 packets arrive to the same destination IP address, the router will ________.
use the decision it made for the first one
In a network mask, the 1s correspond to the ________.
network part
A border router connects different IP ________.
networks
If any row other than the default row matches an IPv4 address, the router will ________.
never choose the default row
Express the mask /18 in dotted decimal notation.
none of the above
In the mask /14, how many 1s are there?
none of the above
The network part of an IPv4 address is ________ bits long.
8
There is a row for each host address in a(n) ________.
Ethernet switching table
If no other row matches, the router will select the ________ row as its best match.
Last
A packet arrives at a router with destination IP address 128.171.3.2. Row 47 has the destination value 128.171.0.0. Is Row 47 a match?
Yes
The next-hop router listed in the last row is the ________ router.
default
UDP is a standard for ________.
packet delivery
DNS is a ________ protocol.
supervisory
If you see an IPv4 address, what do you know for certain?
the total length
A mask has ________ bits.
32
The total length of an IPv4 address is ________ bits.
32
The main version of Internet Protocol in use today is IP version ________.
4
In the IPv4 address 1.2.3.4, what is the network part?
We cannot say.
In the final step, the router sends the packet ________.
both A and B
The Internet is organized in a ________.
mesh
In a routing table, Rows 47 and 3497 both match the destination IP address of an arriving packet's IP address. What row will the router look at first when trying to find matching rows?
1
In the mask 255.255.255.0, how many 1s are there?
24
Express the mask /24 in dotted decimal notation.
255.255.255.0
Row 2707 has the mask /16 and the cost metric 20. Row 4400 has the mask /14 and the cost metric 10. The default row has a metric cost of 2. Which row will the router choose if both are matches?
2707
Row 2707 has the mask /16 and the reliability metric 20. Row 4400 has the mask /16 and the reliability metric 10. Which row will the router choose if both are matches?
2707
Deciding what interface and to what device to send the packet back out is step ________ in the routing process.
3
A packet arrives at a router with destination IP address 62.17.3.2. Row 47 has the destination value 62.17.4.0. Is Row 47 a match?
No
For 100,000 addresses, which will have fewer rows?
a routing table
In a subnet mask, the 1s correspond to the ________.
all of the above
The first step in the routing process involves ________.
comparing the packet's destination IP address to all rows
If the next-hop router field in the best-match row says "local", the router should address the packet to the ________.
destination host
If a router receives 20 packets in a row going to the same destination IP address, the standard calls for it to ________.
go through all three steps for each
Router ports are called ________.
interfaces
Router sockets for wire and optical fiber cords are called ________.
interfaces