CPSC 353 - Ch 5

The key characteristics of an SDN architecture are (choose all that apply)

Flow-based forwarding Separation of Data and Control Plane Network control functions: external to data-plane switches A programmable network (all of them)

The Structure of Management Information (SMI) is a data definition language that is used to define the objects in a Management Information Base

True

The original purpose of the ICMP source quench message was to perform congestion control

True

The two approaches to computing forwarding tables are: per-router control and logically centralized control

True

RIP uses the services of _______.

UDP

The SNMP PDU is typically carried in the payload of a _________________

UDP datagram

Routing between autonomous systems is referred to as ______ routing.

interdomain routing

Routing inside an autonomous system is referred to as ________ routing

intradomain

In distance vector routing, each node periodically shares its routing table with _________ and whenever there is a change.

its immediate neighbors

The Open Shortest Path First (OSPF) protocol is an intradomain routing protocol based on _______ routing

link state

The _________ routing uses the Dijkstra algorithm to build a routing table

link state

A one-to-many communication between one source and a specific group of hosts is classified as a _______ communication

multicast

In OSPF, a ________ defines the links of a network.

network link

ICMP is a (an) _________ layer protocol

network-layer protocol

ICMP is a (an) _________ layer protocol.

network-layer protocol.

In RIP, the ________ timer controls the advertising of regular update messages.

periodic

In OSPF, a ________ link connects two routers without any other host or router in between.

point-to-point

The ICMP protocol

runs directly on top of IP

In multicast routing, each involved router needs to construct a ________ path tree for each group.

shortest

SDN is an Acronym for

software defined networking

In OSPF, a ________ link is a network connected to only one router.

stub

In OSPF, a _______ link is a network with several routers attached to it.

transient

In the OSPF, a _______ link is a network with several routers attached to it.

transient

A one-to-one communication between one source and one destination is classified as a _______ communication.

unicast

In ______, the router forwards the received packet through only one of its interfaces.

unicasting

n ______, the router forwards the received packet through only one of its interfaces.

unicasting

SNMP is an acronym for Simple Network ________ Protocol

Management

The OpenFlow Protocol defines defines message flowing from the controller to the controlled switch including

Modify-State Read-State Send-Packet

MOSPF is an extension to OSPF that provides support for

Multicast routing

The BGP AS-PATH attribute contains the list of ASs through which a router advertisement has passed

True

The BGP AS-PATH attribute contains the list of ASs through which a router advertisement has passed.

True

The layers of the SDN Control Plane are (choose all that apply)

-A communication layer: communicating between the SDN controller and controlled network devices -A network-wide state-management layer - The interface to the network-control application layer

The Internet's OSPF routing protocol is often accomplished by a link-state broadcast algorithm

True

The link-state algorithm in has the following properties:

All of the above: -it requires the source node to know the costs between every pair of adjacent nodes in the graph -it determines the shortest path from the source node to all other nodes -after the nth iteration, the least-cost paths are known to k nodes

__________ is an interdomain routing protocol using path vector routing.

BGP

___________ is an interdomain routing protocol using path vector routing.

BGP

BGP is an acronym for

Border Gateway Protocol

As part of hierarchical routing, hot-potato routing does the following:

Chooses the gateway that has the smallest cost

In OpenFlow, which of the following is a message from the controller to the controlled switch

Configuration

ICMP is an acronym for Internet _____________ Message Protocol

Control

A centralized routing algorithm computers the least-cost path between a source and destination in an iterative, distributed manner

False

Every autonomous system must use the same intra-autonomous system routing algorithm.

False

In a distance-vector routing algorithm, each node has a map of the entire network and determines the shortest path from itself to all other nodes in the network.

False

Inter-AS routing is routing among hosts and routers in the same AS

False

SNMP is a network layer protocol

False

The BGP NEXT-HOP attribute is the IP address of the router interface that ends the AS-PATH

False

The distance-vector algorithm is a link-state algorithm

False

Which of the following is true about ICMP messages?

None of the choices are correct

The _______ protocol allows the administrator to assign a cost, called the metric, to each route

OSPF

The _______ protocol allows the administrator to assign a cost, called the metric, to each route.

OSPF

In OpenFlow, which of the following is a message from the controlled switch to the controller

Packet-In

The OpenFlow Protocol defines messages flowing from the SDN-controlled switch to the controller including

Port-status Packet -in Flow-Removed

The metric used by _______ is the hop count. a) OSPF b) RIP c) BGP d) None of the choices are correct

RIP

Which of the following is not a key characteristic of an SDN architecture

Routing Algorithms running in each router

The OpenFlow Protocol operates over

TCP

The SNMP "Trap" message is sent by a managed entity to inform a managing entity of an exceptional event.

True

Which of the following statements best describes the purpose of the SNMP protocol:

The SNMP protocol is used to convey network management control and information messages between a managing server and an agent executing on behalf of that managing server.

What is the purpose of the SNMP SetRequest message?

To allow a managing entity to set the value of one or more MIB objects in a managed device.

BGP is a path vector protocol

True

Exchanges between OSPF routers can be authenticated

True

In BGP jargon, a route is a prefix along with its BGP attributes

True

In BGP, a route consists of a prefix plus attributes

True

In hot potato routing, the route chosen (from among all possible routes) is that route with the least cost to the NEXT-HOP router beginning that route.

True

In hot potato routing, the route chosen is the route with the least cost to the NEXT-HOP router

True

OSPF and RIP are intra-AS routing protocols

True

The link-state algorithm in has the following properties: A) it requires the source node to know the costs between every pair of adjacent nodes in the graph B) it determines the shortest path from the source node to all other nodes C) after the kth iteration, the least-cost paths are known to k nodes D) all of the above

all of the above

"AS" is an acronym for:

autonomous system

A one-to-all communication between one source and all hosts on a network is classified as a _______ communication

broadcast

A one-to-all communication between one source and all hosts on a network is classified as a _______ communication.

broadcast

Fill in the blank: ICMP is an acronym for Internet _____________ Message Protocol

control

In ________, each node maintains a vector (table) of minimum distances to every node.

distance vector

The Routing Information Protocol (RIP) is an intradomain routing based on _________ routing

distance vector

In RIP, the ________ timer controls the validity of the route.

expiration