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211 Identify 2 characteristics of
PPP?
A.) Uses LLC to establish the link
B.) Default serial encapsulation
C.) Support multiple layer 3 protocols
D.) Offers two types of authentication; PAP and CHAP
Ans C D
PPP is not the default encapsulation and uses LCP not LLC to
establish the link. It support multiple layer 3 protocols and
supports authentication.
212 Identify 3 characteristics of a connection oriented
protocol?
A.) Path determination
B.) Flow control
C.) Acknowledgements
D.) Uses hop count as metric
E.) 3 step handshake
Ans B C E
Connection oriented protocols must first establish the
connection (3 step handshake), employ methods to acknowledge the
receipt of data (acknowledgements) and slow down the flow of
data if required (flow control).
213 What is the maximum hop count for IP RIP?
A.) Infinity
B.) 16
C.) 15
D.) 1
Ans C
15 is the maximum hop count, underscoring the size limitation of
RIP.
214 What is Cisco's default encapsulation method on serial
interfaces?
A.) ANSI
B.) Cisco
C.) Q933a
D.) HDLC
Ans D
Cisco's implementation of HDLC is only compatible with Cisco
routers. It is the default encapsulation type for serial
interfaces.
215 Which of the following is a characteristic of a switch,
but not of a repeater?
A.) Switches forward packets based on the IPX or IP address in
the frame
B.) Switches forward packets based on the IP address in the
frame
C.) Switches forward packets based on the MAC address in the
frame
D.) Switches forward packets based only on the IP address in the
packet
Ans C
A repeater regenerates the signal it receives, a switch makes
decisions based upon MAC addresses to determine whether a frame
should be forwarded. Repeaters forward all packets.
216 Ping uses which Internet layer protocol?
A.) RARP
B.) ICMP
C.) ARP
D.) FTP
Ans B
Internet Control Message Protocol - ICMP is a management
protocol and messaging service provider for IP. Its messages are
carried as IP datagrams.
ICMP is used in the following events:
Destination Unreachable - If a router cannot send an IP packet
any further, it uses an ICMP echo to send a message back to the
sender notifying it that the remote node is unreachable.
Buffer Full - If a routers memory buffer is full ICMP will send
out a message to the originator.
Hops - Each IP datagram is assigned a path. This consists of
hops. If it goes through the maximum number of hops, the packet
is discarded and the discarding router sends an ICMP echo to the
host.
Ping - Ping use ICMP echo message to check connectivity.
217 Which is true regarding store-and-forward switching
method?
A.) Latency varies depending on frame-length
B.) Latency is constant
C.) It is default for all Cisco switches
D.) It only reads the destination hardware address before
forwarding the frame
Ans A
Store-and-Forward switching copies the entire frame into its
buffer and computes the CRC. If a CRC error is detected, the
frame is discarded, or if the frame is a runt (less than 64
bytes including the CRC) or a giant (more than 1518 bytes
including the CRC). The LAN switch then looks up the destination
address in its switching table and determines the outgoing
interface. The frame is then forwarded to the outgoing
interface. Cisco Catalyst 5000 switches uses the
Store-and-Forward method. The problem with Store-and-Forward
switching is latency is increased. Latency also varies with the
size of the frame. The larger the frame, the more latency
associated. This of course is due to the fact that the entire
frame is copied into its buffer before being forwarded.
218 Which three of the following are true statements about
connection-oriented sessions?
A.) The segments delivered are acknowledged back to the sender
upon their reception
B.) Any segments not acknowledged the are retransmitted by the
receiver
C.) A manageable data flow is maintained in order to avoid
congestion, overloading and loss of any data
D.) Segments are sequenced back into their proper order upon
arrival at their destination
Ans A C D
Connection-oriented services are useful for transmitting data
from applications that are intolerant of delays and packet
re-sequencing. FTP and Telnet applications are based on
connection-oriented services as well as some voice and video
programs. Any segment that is not acknowledged by the received
is retransmitted by the sender.
219 What does a metric of 16 hops represent when using RIP?
A.) Number of hops to the destination
B.) Destination unreachable
C.) Number of routers
D.) Bandwidth
Ans B
Routing Information Protocol (RIP) is a distance vector routing
protocol that used hop count as its metric. The maximum hop
count is 15, 16 hops is considered unreachable. RIP updates are
broadcast every 30 seconds by default. RIP has an administrative
distance of 120.
220 You need to come up with a TCP/IP addressing scheme for
your company. Which two factors must you consider when you
define the subnet mask for the network?
A.) The location of DHCP servers
B.) The volume of traffic on each subnet
C.) The number of subnets on the network
D.) The location of the default gateway
E.) The number of host IDs on each subnet
Ans C E
When determining which subnet mask to use, you must determine
how many hosts and how many subnets are required.
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