CPSC 353 Ch5

MOSPF is an extension to OSPF that provides support for Mobile networks Multicast routing Messaging applications Mesh networks

Multicast routing

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

True

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

True

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

True

RIP uses the services of _______. TCP UDP IP None of the choices are correct

UDP

The SNMP PDU is typically carried in the payload of a _________________ UDP datagram TCP segment

UDP datagram

In RIP, the ________ timer controls the validity of the route. garbage collection expiration periodic None of the choices are correct

expiration

In distance vector routing, each node periodically shares its routing table with _________ and whenever there is a change. every other node its immediate neighbors one neighbor None of the choices are correct

its immediate neighbors

Routing algorithms with global state information are often referred to as ___________ algorithms.

link state

Fill in the blank: SNMP is an acronym for Simple Network ________________ Protocol

management

In a graph G = (N, E), a node y is said to be a _________ of node x if (x,y) belongs to E

neighbor

ICMP is a (an) _________ layer protocol. application-layer protocol that helps TCP/IP at the network layer transport-layer protocol that helps TCP/IP at the network layer network-layer protocol. data-link layer protocol that helps TCP/IP at the network layer

network-layer protocol

In OSPF, a ________ link connects two routers without any other host or router in between. point-to-point transient stub None of the choices are correct

point-to-point

In routing among ASs, which of the following issues dominates: number of AS s transversed current congestion levels in the AS s policy

policy

In _________ routing algorithms, routes change very slowly over time, often as a result of human intervention.

static

A one-to-one communication between one source and one destination is classified as a _______ communication. unicast multicast broadcast None of the choices are correct

unicast

In ______, the router forwards the received packet through only one of its interfaces. unicasting multicasting broadcasting None of the choices are correct

unicasting

Which is not one of the layers of an SDN controller A communications layer A network wide a quality of service

A quality of service

BGP is an acronym for

Border Gateway Protocol

As part of hierarchical routing, hot-potato routing does the following: Determines the number of ASes in the shortest AS path from router to destination. Chooses the gateway that has the smallest cost. Provides information to a router about the existence of external networks. Labels suspicious packets as "hot".

Chooses gateway that has the smallest cost

In OpenFlow, which of the following is a message from the controller to the controlled switch Flow-removed Configuration Port-status

Configuration

Which is not a BGP attribute ORIGIN AS_PATH NEXT_HOP DESTINATION

DESTINATION

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

False

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

False

ICMP messages are carried in UDP datagrams True False

False

ICMP messages have a type and a code field and contain the first 12 bytes of the IP datagram that caused the ICMP message to be generated True False

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. True False

False

In the BGP routing algorithm, each AS advertises to its neighbors its estimates of the shortest distances from the AS to all possible destination ASs. True False

False

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

False

OSPF uses BGP for routing among areas. True False

False

SNMP is a network layer protocol True False

False

The SNMP "Trap" message is sent by a managed entity to inform a managing entity of an exceptional event, and requires that the managing entity respond to the event via a "SetRequest" message. True False

False

The distance-vector algorithm is a link-state algorithm True False

False

The management information base (MIB) is a repository of data maintained at a managing entity site, providing the network manager with a centralized, quick-to-query database regarding current network status. True False

False

In OpenFlow, which of the following is a message from the controlled switch to the controller Modify-State Read-State Send-Packet Packet-In

Packet-In

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

True

Which of the following is not a key characteristic of an SDN architecture Flow-based forwarding Separation of data plane and control plane Routing Algorithms running in each router Network control functions external to data-plane switches A programmable network

Routing Algorithms running in each router

SDN is an Acronym for

Software Defined Networking

The OpenFlow Protocol operates over UDP TCP FTP

TCP

Which of the following statements best describes the purpose of the SNMP protocol: The SNMP protocol specifies the actions a network manager should take in response to a specific set of network fault conditions. The SNMP protocol is a tool for gathering data about network conditions and executing remote actions at remote managed devices The SNMP protocol is used by the network manager to provision resources, such as bandwidth, server capacity and other computational/communication resources needed to meet the mission-specific needs of an enterprise

The SNMP protocol is a tool for gathering data about network conditions and executing remote actions at remote managed devices

Which of the following statements best describes the purpose of the SNMP protocol: The SNMP protocol specifies the actions a network manager should take in response to a specific set of network fault conditions. 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. The SNMP protocol is used by the network manager to provision resources, such as bandwidth, server capacity and other computational/communication resources needed to meet the mission-specific needs of an enterprise

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 query the value of a set of MIB object values in a managed device. To allow a managing entity to set the value of one or more MIB objects in a managed device. To allow a managed device to request and receive a set of initial values for MIB objects in the managed device

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 False

True

Exchanges between OSPF routers can be authenticated True False

True

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

True

In BGP, a route consists of a prefix plus attributes True False

True

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

True

OSPF and RIP are intra-AS routing protocols True False

True

"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. unicast multicast broadcast None of the choices are correct

broadcast

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

control

In _______ routing, the least cost route between any two nodes is the route with the minimum distance. path vector distance vector link state None of the choices are correct

distance vector

In ________, each node maintains a vector (table) of minimum distances to every node. path vector distance vector link state None of the choices are correct

distance vector

The Routing Information Protocol (RIP) is an intradomain routing based on _________ routing. distance vector link state path vector None of the choices are correct

distance vector

In ___________ routing algorithms, routes change as the network traffic loads or topology change.

dynamic

A graph G = (N, E) is a set N of nodes and a collection E of _______

edges