Ch. 1 Planning Practice Tables Flashcards
The design requires the number of entries in
a router’s routing table to be reduced.
Summarization.
The design calls for the use of a distance vector
routing protocol. Identify the two approaches that a distance-vector routing protocol can use to prevent loops. (2)
Split Horizon.
Poison Reverse.
The design calls for the use of a link-state routing protocol. (2)
Use OSPF.
Use IS-IS.
The design calls for IPv6 traffic to travel from a source IPv6 address to the nearest device of multiple devices assigned the same destination IPv6 address.
Use anycast.
The design calls for the use of an NBMA network. Identify design issues that might be encountered when using EIGRP or OSPF. (2)
Issue with EIGRP: Split Horizon.
Issue with OSPF: Designated router.
The design calls for the use of Hot Standby Router Protocol (HSRP). Identify the condition that can be created when return traffic flows through a standby HSRP router.
Asymmetric routing (or unicast flooding).
The design needs to mitigate a global synchronization condition (where all TCP flows simultaneously enter TCP slow start).
Use WRED.
The design requires a network to be migrated to a different routing protocol. (2)
Configure both routing protocols, and use
Administrative Distance (AD) to control
which routing protocol is being used.
Use route redistribution as you migrate
individual sections of the network.
The design requires that you virtualize multiple routers inside of physical routers and carry traffic for the virtual networks between those physical routers.
Use Cisco Easy Virtual Networking (EVN).
The plan requires that Split Horizon be
disabled for the hub router in a hub-andspoke
topology. Describe the purpose of
Split Horizon.
Split Horizon is a feature that prevents a
route learned on one interface from being
advertised back out of that same interface.
The plan requires the use of EIGRP as the
routing protocol. Provide a brief description
of EIGRP.
Enhanced Interior Gateway Routing Protocol
(EIGRP) is classified as an advanced distancevector
routing protocol. It was Ciscoproprietary
until early 2013, but is now open
to other vendors. EIGRP uses the Diffusing
Update Algorithm (DUAL) to make its path
selection decisions.
The plan calls for the use of both IPv4 and
IPv6. What network traffic types do IPv4
and IPv6 have in common, and what traffic
types are different?
Both IPv4 and IPv6 use unicasts and
multicasts. However, IPv4 can use broadcasts,
while IPv6 cannot. Also, IPv6 supports
anycasts, while IPv4 does not.
The plan calls for the use of Hot Standby
Router Protocol (HSRP). What can you do to
prevent an asymmetric routing issue, where
traffic is forwarded from a subnet using the
active HSRP router, and some of the return
traffic returns using the standby HSRP router
(because of load balancing)?
Ideally, you should not span a VLAN across
more than one access layer switch. However,
if you must span a VLAN across multiple
access layer switches, you can adjust the
HSRP router’s ARP timer to be equal to or
less than the CAM aging time.
The design calls for the transmission of
interactive voice and video over a network.
What Layer 4 protocols are typically used to
transmit voice and video media? (2)
The Real-time Transport Protocol (RTP) is a
Layer 4 protocol that carries voice and video
media. RTP is encapsulated inside of User
Datagram Protocol (UDP), which is another
Layer 4 protocol.
The plan requires that a network migrate
from IPv4 to IPv6. Identify three strategies
of a successful IPv6 migration. (3)
Check existing equipment for IPv6
compatibility.
Run IPv4 and IPv6 concurrently.
Check the ISP’s support for IPv6.
