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Flashcards in WANs Deck (27)
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1
Q

Is a WAN a public or private link?

A

WANs can be private links via leased lines.

2
Q

Common types of VPN protocols for site to site connections? (x4)

A
  • IPsec - Open standard. Doesnt support Multicast which is used by routers to share routes
  • GRE (Generic Routing Encapsulation) over IPsec - adds support for multicast
  • IPsec VTI (Virtual Tunnel Interface) - Cisco proprietary simplified configuration, supports multicast.
  • DMVPN (Dynamic Multipoint VPN) - Cisco proprietary. Enables full mesh connectivity between all offices although the config steps act like configuring a hub and spoke VPN model.
3
Q

Common type of VPN encryption for end-user to site connections?

A

SSL but sometimes also IPsec

4
Q

Primary WAN connectivity options?

A
  • Leased Line
  • MPLS
  • Satellite
5
Q

Secondary WAN connectivity options?

(can be primary options for small offices)

A
  • DSL
  • Cable Modem
  • Wireless 4G or LTE
6
Q

What will a SLA include?

A
  • Uptime
  • Loss
  • Delay
  • Maybe Jitter
7
Q

What is a Leased Line to Cisco?

A

A point-to-point connection using a serial port.

8
Q

What is PPP?

A

Point-to-Point Protocol

9
Q

What is HDLC?
cHDLC?

A

Protocol used over serial connections
cHDLC is the Cisco proprietary version of HDLC

10
Q

What OSI layer is HDLC

A

Layer 2

11
Q

What OSI layer is PPP for leased line serial connections?

A

Layer 2

12
Q

What side of a link is the clock rate set?
DCE or DTE

A

DCE.

on the Data Communications Equipment (providor),
not on the DTE - Date Termination Equipment (customer)

13
Q

Difference between serial Clock Rate and Interface Bandwidth setting?

A

The bandwidth statement doesn’t affect the physical clocking of the line. The bandwidth statement only effects software policies such as routing protocol metrics and QoS shaping.

14
Q

Default bandwidth of a serial interface?

A

1.544 Mbps (T1)

15
Q

HDLC confg steps:

A
16
Q

PPP config steps:

A
17
Q

Command to view PPP settings:

A

R1# show ppp all

18
Q

What is the default username for CHAP in one-way PPP authentication

A

The remote device’s hostname

19
Q

Command to configure CHAP authentication

A

R1(config-if)# ppp chap password Presto1

20
Q

What is MLPPP

A

MultiLink PPP - Using multiple parallel serial links as one single logical link.

21
Q

MLPPP Config steps:

A
22
Q

Define PPPoE

A

Point-to-Point Protocol over Ethernet

23
Q

Would you configure PPPoE on the router or the DSL model?

A

Either are standard things that are done.

24
Q

PPPoE Config steps:

A
25
Q

What is a ‘Virtual Access’ interface on a Router?

A

A product of a PPPoE dialer configured on the router.

26
Q

Define GRE

A

Generic Routing Encapsulation

Does not support encryption but does support multicast for routing protocol traffic.

Can be paired with IPsec for a full end to end tunnel.

27
Q

GRE Tunnell config steps:

A