Topic 4 - WAN Technologies

Question 1

PPP - Types of Authentication

Answer 1

PAP, CHAP and EAP

Question 2

What is PAP (Password Authentication Protocol)?

Answer 2

2 way Authentication.

The username and password are usually sent in plain text. t.

Question 3

What is CHAP (Challenge-Handshake Authentication Protocol)?

Answer 3

3 way authentication
the remote router sends a challenge to a router that is trying to communicate. The router then responds with an encrypted username and password and if the parameters are correct, the remote router accepts the PPP connection

Question 4

What is the benefit of point-to-point leased line?

Answer 4

Flexibility of design
&
Simply configuration

Question 5

Which command can you enter to verify that a BGP connection to a remote device is established?

Answer 5

show ip bgp summary

Question 6

Which two components are used to identify a neighbor in a BGP configuration?

Answer 6

autonomous system number & IP address

Question 7

At which layer of the OSI model does PPP perform?

Answer 7

Layer 2

Question 8

PPPoE

Answer 8

Point-to-Point Protocol over Ethernet, It Encapsulates PPP frames inside Ethernet frame. Also, offers Authentication, Encryption and Compression.

Question 9

How many bits are added to Over head in PPPoe?

Answer 9

PPP adds 2 bytes and PPPoE adds 6 bytes.

So, 1500 - 8 = 1492 (MTU)

Question 10

GRE?

Answer 10

Generic routing encapsulation (GRE) is a simple site-to-site VPN tunneling protocol.

• Tunnel IP packet across the Internet.
• GRE can encapsulate any OSI layer 3 protocol,
• GRE tunnel interface address will be on same subnet.

Question 11

GRE Stateless?

Answer 11

GRE is Stateless and do not include flow control.

Question 12

DSCP Value

Answer 12

Default, EF, Class selector and AF ( Assured forwarding )

Question 13

IP precedence bits and DSCP Bits in QOS Marking

Answer 13

IP - 3bits and DSCP - 6 bits

Question 14

What TCP port number does BGP use?

Answer 14

Port 179

Question 15

Which packet-switched WAN technology offers high-bandwidth connectivity capable of managing data, voice, and video all on the same infrastructure?

Answer 15

Metro Ethernet

Question 16

HDLC

Answer 16

High-level Data Link Control) is a bit-oriented synchronous data link protocol used for serial communications.

HDLC is the default encapsulation on serial interfaces of Cisco routers

Question 17

Which statement about RADIUS security is true?

Answer 17

It supports EAP authentication for connecting to wireless networks.

Question 18

Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanisms?

Answer 18

PPP

Question 19

Which protocol is an open standard protocol framework that is commonly used in VPNs to provide secure end-to-end communications?

Answer 19

IPsec

Question 20

Which PPP subprotocol negotiates authentication options?

Answer 20

LCP - Link Control Protocol

Question 21

What devices must configure the clock rate on a point-to-point link?

Answer 21

DCE

The DCE device controls the communication and should have the clock rate set.

Question 22

Which PPP sub-protocol is responsible for allowing PPP to support multiple network protocols?

Answer 22

NCP

The NCP protocol allows PPP to function with different network protocols, such as IP or IPX.