Routing Technologies and Bandwidth Management Flashcards
If a PC on an Ethernet network attempts to communicate with a host on a different subnet, what destination IP address and destination MAC address will
be placed in the packet/frame header sent by the PC?
a. Destination IP: IP address of the default gateway. Destination
MAC: MAC address of the default gateway.
b. Destination IP: IP address of the remote host. Destination MAC:
MAC address of the default gateway.
c. Destination IP: IP address of the remote host. Destination MAC:
MAC address of the remote host.
Answer: b. Note that the destination IP address does not change in the packet.
However, as the router sends the frame out the exit interface heading toward the
destination, it will update the destination MAC address to the next hop/device.
What protocol is used to request a MAC address that corresponds to a known
IPv4 address on the local network?
a. IGMP
b. TTL
c. ICMP
d. ARP
Answer: d. ARP is one of the many name resolution protocols we deal with. In
this case, the names are Layer 2 and Layer 3 addresses.
What is the network address and subnet mask of a default route?
a. 255.255.255.255/32
b. 0.0.0.0/32
c. 255.255.255.255/0
d. 0.0.0.0/0
Answer: d. The default route is 0.0.0.0/0.
What routing protocol characteristic indicates the believability of the routing
protocol (compared to other routing protocols)?
a. Weight
b. Metric
c. Administrative distance
d. SPF algorithm
Answer: c. The better the administrative distance, the more believable the
protocol. Lower is better for the AD score.
Which of the following are distance-vector routing protocol features that can
prevent routing loops? (Choose two.)
a. Reverse path forwarding (RPF) check
b. Split horizon
c. Poison reverse
d. Rendezvous point
Answer: b, c. Split horizon and poison reverse are critical loop preventions for
early routing protocols.
Which of the following is a distance-vector routing protocol with a maximum
usable hop count of 15?
a. BGP
b. EIGRP
c. RIP
d. OSPF
Answer: c. RIP cannot be used in large networks due to a maximum hop
count of 15.
Which of the following routing protocols is an EGP?
a. BGP
b. EIGRP
c. RIP
d. OSPF
Answer: a. BGP is the protocol that makes the Internet a reality
What is the term for unpredictable variation in delay in a modern network?
a. Congestion
b. Contention
c. Jitter
d. Serialization delay
Answer: c. Jitter is how we describe this unpredictable variation in delay.
The RSVP protocol is associated with which overall approach to QoS in a
modern network?
a. DiffServ
b. IntServ
c. FIFO
d. Best effort
Answer: b. IntServ features the use of RSVP.
What QoS tool seeks to smooth out bandwidth utilization by buffering excess
packets?
a. Traffic policing
b. Traffic shaping
c. Weighted Random Early Detection (WRED)
d. Integrated Services (IntServ)
Answer: b. Traffic shaping seeks to smooth traffic volumes by buffering excess
packets.
