Chapter 10

1:
A:	An Intermediate System is the ISO term for a router.
2:
A:	A Network Protocol Data Unit is the ISO term for a packet.
3:
A:	An L1 router has no direct connections to another area. An L2 router only routes inter-area traffic. An L1/L2 router routes both inter-area and intra-area traffic and acts as an inter-area gateway for L1 routers.
4:
A:	The borders of IS-IS areas are between routers, on links. The borders of OSPF areas are defined by the routers themselves .
5:
A:	The Network Entity Title is an address by which a router identifies both itself and the area in which it resides.
6:
A:	The NSAP Selector should be set to 0x00 in a NET.
7:
A:	The System ID uniquely identifies a router within an IS-IS domain.
8:
A:	The portion of the NET preceding the last seven octets is the area address.
9:
A:	IS-IS does not elect a BDR.
10:
A:	The Pseudonode ID is the last octet of a LAN ID. Its purpose is to distinguish LAN IDs which are originated by a single router which is the DR on multiple LANs.
11:
A:	The MaxAge of an IS-IS LSP is 1200 seconds (20 minutes).
12:
A:	OSPF increments the age up to MaxAge; IS-IS decrements the age down to 0. A new OSPF LSA has an age of 0, whereas a new IS-IS LSP has an age of MaxAge.
13:
A:	The refresh rate of an IS-IS router is 900 seconds (15 minutes).
14:
A:	A Complete Sequence Number Packet contains a full listing of all LSPs in a database. A CSNP is periodically sent by the Designated Router on a broadcast network to maintain database synchronization.
15:
A:	A Partial Sequence Number Packet contains a listing of one or more LSPs. It has two uses: On point-to-point networks, it is used to acknowledge the receipt of LSPs. On broadcast networks, it is used to request LSPs.
16:
A:	An IS-IS router uses the Overload bit to inform its neighbors that it is experiencing a memory overload and cannot store the entire link state database.
17:
A:	The Attached bit is used by L1/L2 routers to inform L1 routers that it is attached to the L2 backbone.
18:
A:	The ISO specifies four metrics: Default, Expense, Delay, and Error. Cisco supports only the Default metric.
19:
A:	The maximum value of any of the IS-IS metrics is 63.
20:
A:	The maximum metric value of an IS-IS route is 1023.
21:
A:	L1 IS-IS metrics apply to intra-area routes, and L2 IS-IS metrics apply to inter-area routes.
22:
A:	Internal metrics apply to routes to destinations within the IS-IS domain. External metrics apply to routes to destinations external to the IS-IS domain.