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Indicate whether the statement is true or false.
1. If a packet with TTL=1 arrives at a router, the router must discard the packet because it cannot decrement the
TTL to 0 and forward the packet.
a.
True
b.
False
2. When a packet is fragmented, all fragments are given different TTL values.
a.
True
b.
False
3. A network is usually said to be converged when all the routers know a loop-free path to get to all other
networks.
a.
True
b.
False
4. Routed protocols are Layer 1 protocols that are used to get packets through an internetwork.
a.
True
b.
False
5. ARP is used to obtain the hardware address of the destination IP hosts.
a.
True
b.
False
Indicate the answer choice that best completes the statement or answers the question.
6. Which of the following prevents a router from advertising a network on the same interface from which it
learned that network?
a.
System routing
b.
Link state routing
c.
On-demand routing
d.
Split horizon
7. Which of the following do routers use to select a routing path when there are multiple paths available?
a.
tokens
b.
precedence
c.
Type of Service
d.
repeaters
8. Which of the following is a method that allows an IP host to use a simplified subnetting design?
a.
Proxy ARP
b.
Link Control
c.
IPCP
d.
IPCONFIG
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9. What type of routing protocol uses information about the distances between networks rather than the amount
of time it takes for traffic to make its way from the source network to the destination network?
a.
triggered
b.
link-state
c.
distance vector
d.
split horizon
10. What do routers use in order to connect autonomous systems (ASs)?
a.
distance vectors
b.
exterior gateway protocols
c.
agents
d.
host routes
11. Which of the following can summarize routing information before sending link-state packets to other
networks?
a.
Split horizons
b.
Distance vectors
c.
Backbone areas
d.
Area border routers
12. Two examples of routing protocols that support multiple types of services are OSPF and which of the
following?
a.
Border Gateway Protocol
b.
T-carrier
c.
TOS
d.
IPCONFIG
13. Protocols at which layer of the OSI model have the primary function of moving datagrams through an
internetwork connected by routers?
a.
Data link
b.
Application
c.
Network
d.
Transport
14. What is required to get the packet from one IP host to another IP host on a single network?
a.
frame
b.
hardware address
c.
delimiter
d.
data link
15. Which of the following occurs on a network when ICMP is turned off and a router discards packets without
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sending any notification about its actions?
a.
black hole
b.
agent
c.
link state
d.
distance vector
16. Which configuration option allows a router to watch for traffic on its LAN that does not match its own IP
address, so the router can add entries for that traffic in its ARP cache and routing table?
a.
link-state
b.
Local Area Mobility
c.
intra-domain routing
d.
external route entry
17. On a network that is low on available bandwidth, which of the following processes causes more traffic on
the wire?
a.
data encapsulation
b.
error-detection
c.
circuit switching
d.
fragment retransmission
18. What does a router use to determine which packet to send when several packets are queued for transmission
from a single-output interface?
a.
proxy ARP
b.
precedence
c.
preamble
d.
frames
19. The default TTL in Windows Server 2008, Windows Server 2012, Windows 7, and Windows 10 is which of
the following?
a.
64
b.
72
c.
112
d.
128
20. What method is used to obtain an IP address for an associated data link address?
a.
Proxy ARP
b.
IEEE
c.
Network Control
d.
RARP
21. IP fragmentation enables a larger packet to be automatically fragmented into smaller packets to cross a link
that supports a smaller MTU. Which of the following devices performs this fragmentation?
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a.
token
b.
router
c.
repeater
d.
cable modem
22. What is the recommended starting TTL value?
a.
64
b.
72
c.
112
d.
128
23. Which of the following is a general-purpose protocol that provides WAN data link encapsulation services
similar to those available for LAN encapsulations?
a.
Border Gateway Protocol
b.
Point-to-Point Protocol
c.
Link Control Protocol
d.
Token ring
24. All IPv4 packets have a predefined lifetime indicated in which field?
a.
Time To Live
b.
Frame Check Sequence
c.
Protocol Identifier
d.
Flag
25. In a RIPv2 packet, which field contains a plain text password?
a.
Authentication
b.
Route Tag
c.
Next Hop
d.
Address Family
26. Which of the following terms best describes a compilation of information about all the networks that the
router can reach?
a.
host
b.
routing table
c.
black hole
d.
agent
Enter the appropriate word(s) to complete the statement.
27. ____________________ is a technique for assigning costs to routes designed to prevent routing loops.
28. The method distance vector protocols use to prevent packets from endlessly circulating around a routing
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loop is called ____________________.
29. The ____________________ field is a two-byte field that provides bit-level integrity checks for data as sent.
30. At the Data Link layer, protocol data units are called ____________________.
31. ____________________ system routing enables BGP peer routers to exchange routing information across
an AS that does not support BGP.
Match each item with a statement below.
a.
internal route entry
b.
areas
c.
BGP
d.
Link Control Protocol (LCP)
e.
Point-to-Point Protocol over Ethernet (PPPoE)
f.
ARP cache
g.
hardware address
h.
route resolution process
i.
host route
32. a route entry learned from within the same area as the computing device
33. groups of contiguous networks
34. an interdomain routing protocol that replaces Exterior Gateway Protocol (EGP)
35. a special connection negotiation protocol that PPP uses to establish point-to-point links between peers for
ongoing communications
36. a protocol used by many Internet service providers to authenticate and manage broadband subscribers
37. a temporary table in memory that consists of recent ARP entries
38. the address of the NIC that is typically used as the data link address
39. that process that a host undergoes to determine whether a desired destination is local or remote and, if
remote, which next-hop router to use
40. a routing table entry with a 32-bit subnet mask designed to reach a specific network host
41. Briefly describe each of the eight levels of precedence.
42. Briefly describe the following fields in the PPP header and trailer: Flag, protocol identifier, and Frame
Check Sequence.
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43. What are the two most important jobs of the Data Link layer?
44. Discuss the difference between the following ARP packet fields: Opcode field and the Protocol Type field.
45. WAN encapsulation of frames at the Data Link layer involves one or more services. Briefly discuss four of
these services.
46. How do link-state routing protocols differ from distance vector routing protocols?
47. Provide a brief description of the two types of route table entries.
48. Briefly discuss the following Ethernet II frame type fields and structures: Preamble, Destination Address
Field, Source Address Field, and Type Field.
49. The Target Hardware Address field indicates the desired target's hardware address, if known. In ARP
requests, this field is typically filled with all 0s. In ARP replies, what should this field contain?
50. Discuss three ways in which a router entry can be placed in a routing table.
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Answer Key
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