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Cisco® 300-550 Exam Practice Questions (P. 1)

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Question #1
How are authentication credentials sent in a Cisco APIC REST API authorization request?
  1. A
    by using OAuth
  2. B
    in a token in the header
  3. C
    by using Basic Auth
  4. D
    in JSON in the payload

Correct Answer:
B
Authentication to the REST API for username/password-based authentication uses a special subset of request URIs, including aaaLogin, aaaLogout and aaaRefresh as the Dn target of a POST operation. Their payloads contain a simple XML or JSON payload containing the MO representation of an aaaUser object with attributes name and pwd defining the username and password, for example: <aaaUser name=admin pwd=insieme/>. The response to the POSTs will contain an authentication token as both a Set-Cookie header as well as an attribute to the aaaLogin object in the response named token, for which the XPath is / imdata/aaaLogin/@token if encoded as XML. Subsequent operations on the REST API can use this token value as a Cookie named "APIC-cookie" to have future requests authenticated.
Reference:
http://aci-troubleshooting-book.readthedocs.io/en/latest/rest.html

Question #2
Which two statements about OpenFlow are true? (Choose two.)
  1. A
    The OpenFlow flow table contains header fields, counters, and actions
  2. B
    OpenFlow automatically determines network forwarding rules.
  3. C
    OpenFlow interfaces with the management plane
  4. D
    OpenFlow is a southbound protocol
  5. E
    OpenFlow is an agentless technology, like Ansible
  6. F
    OpenFlow is a northbound protocol

Correct Answer:
AF
Reference:
http://archive.openflow.org/documents/openflow-spec-v1.0.0.pdf

Question #3
Where is the node-ui.log stored on the Cisco APIC-EM appliance?
  1. A
    in the /var/log/grapevine/services/node-ui directory within the container that is running the node-ui instance
  2. B
    in the Cassandra database instance that is running within the container that is running the node-ui instance
  3. C
    in the /opt/CSCOapicem/logs/node-ui directory within the Cisco APIC-EM appliance root
  4. D
    in the /var/log/grapevine/services/node-ui directory within the Cisco APIC-EM appliance root
  5. E
    in the Cisco APIC-EM Cassandra database instance

Correct Answer:
A
A host can be either an appliance, server or virtual machine where Cisco APIC-EM has been installed. Within the hosts are the Linux containers running instances of the Grapevine clients. The Grapevine clients run the different services. The Grapevine root runs as an application on the host itself and not in any Linux containers.

Question #4
DRAG DROP -
Drag and drop the technology on the left to its appropriate use case on the right.
Select and Place:


Correct Answer:

Question #5
Which network configuration protocol uses JSON as a data representation format?
  1. A
    NETCONF
  2. B
    SOAP
  3. C
    RESTCONF
  4. D
    HTML

Correct Answer:
B
JSON-RPC is an RPC protocol built on JSON, as a replacement for

XML-RPC -
or

SOAP -
. It is a simple protocol that defines only a handful of data types and commands. JSON-RPC lets a system send notifications (information to the server that does not require a response) and multiple calls to the server that can be answered out of order. Example of a JSON-RPC 2.0 request and response using positional parameters.
Reference:
https://en.wikipedia.org/wiki/JSON

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